Vulnerabilities > CVE-2006-6921 - Denial-Of-Service vulnerability in Linux Kernel 2.6.20.1

047910
CVSS 2.1 - LOW
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
local
low complexity
linux
nessus

Summary

Unspecified versions of the Linux kernel allow local users to cause a denial of service (unrecoverable zombie process) via a program with certain instructions that prevent init from properly reaping a child whose parent has died.

Vulnerable Configurations

Part Description Count
OS
Linux
1

Nessus

  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2007-0939.NASL
    descriptionUpdated kernel packages that fix various security issues in the Red Hat Enterprise Linux 4 kernel are now available. This update has been rated as having important security impact by the Red Hat Security Response Team. The Linux kernel is the core of the operating system. These updated kernel packages contain fixes for the following security issues : * A flaw was found in the handling of process death signals. This allowed a local user to send arbitrary signals to the suid-process executed by that user. A successful exploitation of this flaw depends on the structure of the suid-program and its signal handling. (CVE-2007-3848, Important) * A flaw was found in the CIFS file system. This could cause the umask values of a process to not be honored on CIFS file systems where UNIX extensions are supported. (CVE-2007-3740, Important) * A flaw was found in the VFAT compat ioctl handling on 64-bit systems. This allowed a local user to corrupt a kernel_dirent struct and cause a denial of service. (CVE-2007-2878, Important) * A flaw was found in the Advanced Linux Sound Architecture (ALSA). A local user who had the ability to read the /proc/driver/snd-page-alloc file could see portions of kernel memory. (CVE-2007-4571, Moderate) * A flaw was found in the aacraid SCSI driver. This allowed a local user to make ioctl calls to the driver that should be restricted to privileged users. (CVE-2007-4308, Moderate) * A flaw was found in the stack expansion when using the hugetlb kernel on PowerPC systems. This allowed a local user to cause a denial of service. (CVE-2007-3739, Moderate) * A flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped which could lead to a denial of service. (CVE-2006-6921, Moderate) * A flaw was found in the CIFS file system handling. The mount option
    last seen2020-06-01
    modified2020-06-02
    plugin id37953
    published2009-04-23
    reporterThis script is Copyright (C) 2009-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/37953
    titleCentOS 4 : kernel (CESA-2007:0939)
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20080305_KERNEL_ON_SL5_X.NASL
    descriptionThese updated packages fix the following security issues : - a flaw in the hypervisor for hosts running on Itanium architectures allowed an Intel VTi domain to read arbitrary physical memory from other Intel VTi domains, which could make information available to unauthorized users. (CVE-2007-6207, Important) - two buffer overflow flaws were found in ISDN subsystem. A local unprivileged user could use these flaws to cause a denial of service. (CVE-2007-5938: Important, CVE-2007-6063: Moderate) - a possible NULL pointer dereference was found in the subsystem used for showing CPU information, as used by CHRP systems on PowerPC architectures. This may have allowed a local unprivileged user to cause a denial of service (crash). (CVE-2007-6694, Moderate) - a flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped, possibly causing a denial of service. (CVE-2006-6921, Moderate) As well, these updated packages fix the following bugs : - a bug was found in the Linux kernel audit subsystem. When the audit daemon was setup to log the execve system call with a large number of arguments, the kernel could run out of memory, causing a kernel panic. - on IBM System z architectures, using the IBM Hardware Management Console to toggle IBM FICON channel path ids (CHPID) caused a file ID miscompare, possibly causing data corruption. - when running the IA-32 Execution Layer (IA-32EL) or a Java VM on Itanium architectures, a bug in the address translation in the hypervisor caused the wrong address to be registered, causing Dom0 to hang. - on Itanium architectures, frequent Corrected Platform Error errors may have caused the hypervisor to hang. - when enabling a CPU without hot plug support, routines for checking the presence of the CPU were missing. The CPU tried to access its own resources, causing a kernel panic. - after updating to kernel-2.6.18-53.el5, a bug in the CCISS driver caused the HP Array Configuration Utility CLI to become unstable, possibly causing a system hang, or a kernel panic. - a bug in NFS directory caching could have caused different hosts to have different views of NFS directories. - on Itanium architectures, the Corrected Machine Check Interrupt masked hot-added CPUs as disabled. - when running Oracle database software on the Intel 64 and AMD64 architectures, if an SGA larger than 4GB was created, and had hugepages allocated to it, the hugepages were not freed after database shutdown. - in a clustered environment, when two or more NFS clients had the same logical volume mounted, and one of them modified a file on the volume, NULL characters may have been inserted, possibly causing data corruption. These updated packages resolve several severe issues in the lpfc driver : - a system hang after LUN discovery. - a general fault protection, a NULL pointer dereference, or slab corruption could occur while running a debug on the kernel. - the inability to handle kernel paging requests in
    last seen2020-06-01
    modified2020-06-02
    plugin id60370
    published2012-08-01
    reporterThis script is Copyright (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/60370
    titleScientific Linux Security Update : kernel on SL5.x i386/x86_64
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2007-0939.NASL
    descriptionFrom Red Hat Security Advisory 2007:0939 : Updated kernel packages that fix various security issues in the Red Hat Enterprise Linux 4 kernel are now available. This update has been rated as having important security impact by the Red Hat Security Response Team. The Linux kernel is the core of the operating system. These updated kernel packages contain fixes for the following security issues : * A flaw was found in the handling of process death signals. This allowed a local user to send arbitrary signals to the suid-process executed by that user. A successful exploitation of this flaw depends on the structure of the suid-program and its signal handling. (CVE-2007-3848, Important) * A flaw was found in the CIFS file system. This could cause the umask values of a process to not be honored on CIFS file systems where UNIX extensions are supported. (CVE-2007-3740, Important) * A flaw was found in the VFAT compat ioctl handling on 64-bit systems. This allowed a local user to corrupt a kernel_dirent struct and cause a denial of service. (CVE-2007-2878, Important) * A flaw was found in the Advanced Linux Sound Architecture (ALSA). A local user who had the ability to read the /proc/driver/snd-page-alloc file could see portions of kernel memory. (CVE-2007-4571, Moderate) * A flaw was found in the aacraid SCSI driver. This allowed a local user to make ioctl calls to the driver that should be restricted to privileged users. (CVE-2007-4308, Moderate) * A flaw was found in the stack expansion when using the hugetlb kernel on PowerPC systems. This allowed a local user to cause a denial of service. (CVE-2007-3739, Moderate) * A flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped which could lead to a denial of service. (CVE-2006-6921, Moderate) * A flaw was found in the CIFS file system handling. The mount option
    last seen2020-06-01
    modified2020-06-02
    plugin id67580
    published2013-07-12
    reporterThis script is Copyright (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/67580
    titleOracle Linux 4 : kernel (ELSA-2007-0939)
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2008-0154.NASL
    descriptionUpdated kernel packages that fix various security issues and several bugs are now available for Red Hat Enterprise Linux 5. This update has been rated as having important security impact by the Red Hat Security Response Team. The kernel packages contain the Linux kernel, the core of any Linux operating system. These updated packages fix the following security issues : * a flaw in the hypervisor for hosts running on Itanium architectures allowed an Intel VTi domain to read arbitrary physical memory from other Intel VTi domains, which could make information available to unauthorized users. (CVE-2007-6207, Important) * two buffer overflow flaws were found in ISDN subsystem. A local unprivileged user could use these flaws to cause a denial of service. (CVE-2007-5938: Important, CVE-2007-6063: Moderate) * a possible NULL pointer dereference was found in the subsystem used for showing CPU information, as used by CHRP systems on PowerPC architectures. This may have allowed a local unprivileged user to cause a denial of service (crash). (CVE-2007-6694, Moderate) * a flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped, possibly causing a denial of service. (CVE-2006-6921, Moderate) As well, these updated packages fix the following bugs : * a bug was found in the Linux kernel audit subsystem. When the audit daemon was setup to log the execve system call with a large number of arguments, the kernel could run out of memory, causing a kernel panic. * on IBM System z architectures, using the IBM Hardware Management Console to toggle IBM FICON channel path ids (CHPID) caused a file ID miscompare, possibly causing data corruption. * when running the IA-32 Execution Layer (IA-32EL) or a Java VM on Itanium architectures, a bug in the address translation in the hypervisor caused the wrong address to be registered, causing Dom0 to hang. * on Itanium architectures, frequent Corrected Platform Error errors may have caused the hypervisor to hang. * when enabling a CPU without hot plug support, routines for checking the presence of the CPU were missing. The CPU tried to access its own resources, causing a kernel panic. * after updating to kernel-2.6.18-53.el5, a bug in the CCISS driver caused the HP Array Configuration Utility CLI to become unstable, possibly causing a system hang, or a kernel panic. * a bug in NFS directory caching could have caused different hosts to have different views of NFS directories. * on Itanium architectures, the Corrected Machine Check Interrupt masked hot-added CPUs as disabled. * when running Oracle database software on the Intel 64 and AMD64 architectures, if an SGA larger than 4GB was created, and had hugepages allocated to it, the hugepages were not freed after database shutdown. * in a clustered environment, when two or more NFS clients had the same logical volume mounted, and one of them modified a file on the volume, NULL characters may have been inserted, possibly causing data corruption. These updated packages resolve several severe issues in the lpfc driver : * a system hang after LUN discovery. * a general fault protection, a NULL pointer dereference, or slab corruption could occur while running a debug on the kernel. * the inability to handle kernel paging requests in
    last seen2020-06-01
    modified2020-06-02
    plugin id31388
    published2008-03-07
    reporterThis script is Copyright (C) 2008-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/31388
    titleRHEL 5 : kernel (RHSA-2008:0154)
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2008-0154.NASL
    descriptionFrom Red Hat Security Advisory 2008:0154 : Updated kernel packages that fix various security issues and several bugs are now available for Red Hat Enterprise Linux 5. This update has been rated as having important security impact by the Red Hat Security Response Team. The kernel packages contain the Linux kernel, the core of any Linux operating system. These updated packages fix the following security issues : * a flaw in the hypervisor for hosts running on Itanium architectures allowed an Intel VTi domain to read arbitrary physical memory from other Intel VTi domains, which could make information available to unauthorized users. (CVE-2007-6207, Important) * two buffer overflow flaws were found in ISDN subsystem. A local unprivileged user could use these flaws to cause a denial of service. (CVE-2007-5938: Important, CVE-2007-6063: Moderate) * a possible NULL pointer dereference was found in the subsystem used for showing CPU information, as used by CHRP systems on PowerPC architectures. This may have allowed a local unprivileged user to cause a denial of service (crash). (CVE-2007-6694, Moderate) * a flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped, possibly causing a denial of service. (CVE-2006-6921, Moderate) As well, these updated packages fix the following bugs : * a bug was found in the Linux kernel audit subsystem. When the audit daemon was setup to log the execve system call with a large number of arguments, the kernel could run out of memory, causing a kernel panic. * on IBM System z architectures, using the IBM Hardware Management Console to toggle IBM FICON channel path ids (CHPID) caused a file ID miscompare, possibly causing data corruption. * when running the IA-32 Execution Layer (IA-32EL) or a Java VM on Itanium architectures, a bug in the address translation in the hypervisor caused the wrong address to be registered, causing Dom0 to hang. * on Itanium architectures, frequent Corrected Platform Error errors may have caused the hypervisor to hang. * when enabling a CPU without hot plug support, routines for checking the presence of the CPU were missing. The CPU tried to access its own resources, causing a kernel panic. * after updating to kernel-2.6.18-53.el5, a bug in the CCISS driver caused the HP Array Configuration Utility CLI to become unstable, possibly causing a system hang, or a kernel panic. * a bug in NFS directory caching could have caused different hosts to have different views of NFS directories. * on Itanium architectures, the Corrected Machine Check Interrupt masked hot-added CPUs as disabled. * when running Oracle database software on the Intel 64 and AMD64 architectures, if an SGA larger than 4GB was created, and had hugepages allocated to it, the hugepages were not freed after database shutdown. * in a clustered environment, when two or more NFS clients had the same logical volume mounted, and one of them modified a file on the volume, NULL characters may have been inserted, possibly causing data corruption. These updated packages resolve several severe issues in the lpfc driver : * a system hang after LUN discovery. * a general fault protection, a NULL pointer dereference, or slab corruption could occur while running a debug on the kernel. * the inability to handle kernel paging requests in
    last seen2020-06-01
    modified2020-06-02
    plugin id67659
    published2013-07-12
    reporterThis script is Copyright (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/67659
    titleOracle Linux 5 : kernel (ELSA-2008-0154)
  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2008-0154.NASL
    descriptionUpdated kernel packages that fix various security issues and several bugs are now available for Red Hat Enterprise Linux 5. This update has been rated as having important security impact by the Red Hat Security Response Team. The kernel packages contain the Linux kernel, the core of any Linux operating system. These updated packages fix the following security issues : * a flaw in the hypervisor for hosts running on Itanium architectures allowed an Intel VTi domain to read arbitrary physical memory from other Intel VTi domains, which could make information available to unauthorized users. (CVE-2007-6207, Important) * two buffer overflow flaws were found in ISDN subsystem. A local unprivileged user could use these flaws to cause a denial of service. (CVE-2007-5938: Important, CVE-2007-6063: Moderate) * a possible NULL pointer dereference was found in the subsystem used for showing CPU information, as used by CHRP systems on PowerPC architectures. This may have allowed a local unprivileged user to cause a denial of service (crash). (CVE-2007-6694, Moderate) * a flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped, possibly causing a denial of service. (CVE-2006-6921, Moderate) As well, these updated packages fix the following bugs : * a bug was found in the Linux kernel audit subsystem. When the audit daemon was setup to log the execve system call with a large number of arguments, the kernel could run out of memory, causing a kernel panic. * on IBM System z architectures, using the IBM Hardware Management Console to toggle IBM FICON channel path ids (CHPID) caused a file ID miscompare, possibly causing data corruption. * when running the IA-32 Execution Layer (IA-32EL) or a Java VM on Itanium architectures, a bug in the address translation in the hypervisor caused the wrong address to be registered, causing Dom0 to hang. * on Itanium architectures, frequent Corrected Platform Error errors may have caused the hypervisor to hang. * when enabling a CPU without hot plug support, routines for checking the presence of the CPU were missing. The CPU tried to access its own resources, causing a kernel panic. * after updating to kernel-2.6.18-53.el5, a bug in the CCISS driver caused the HP Array Configuration Utility CLI to become unstable, possibly causing a system hang, or a kernel panic. * a bug in NFS directory caching could have caused different hosts to have different views of NFS directories. * on Itanium architectures, the Corrected Machine Check Interrupt masked hot-added CPUs as disabled. * when running Oracle database software on the Intel 64 and AMD64 architectures, if an SGA larger than 4GB was created, and had hugepages allocated to it, the hugepages were not freed after database shutdown. * in a clustered environment, when two or more NFS clients had the same logical volume mounted, and one of them modified a file on the volume, NULL characters may have been inserted, possibly causing data corruption. These updated packages resolve several severe issues in the lpfc driver : * a system hang after LUN discovery. * a general fault protection, a NULL pointer dereference, or slab corruption could occur while running a debug on the kernel. * the inability to handle kernel paging requests in
    last seen2020-06-01
    modified2020-06-02
    plugin id43674
    published2010-01-06
    reporterThis script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/43674
    titleCentOS 4 / 5 : kernel (CESA-2008:0154)
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20071101_KERNEL_ON_SL4_X.NASL
    description - A flaw was found in the handling of process death signals. This allowed a local user to send arbitrary signals to the suid-process executed by that user. A successful exploitation of this flaw depends on the structure of the suid-program and its signal handling. (CVE-2007-3848, Important) - A flaw was found in the CIFS file system. This could cause the umask values of a process to not be honored on CIFS file systems where UNIX extensions are supported. (CVE-2007-3740, Important) - A flaw was found in the VFAT compat ioctl handling on 64-bit systems. This allowed a local user to corrupt a kernel_dirent struct and cause a denial of service. (CVE-2007-2878, Important) - A flaw was found in the Advanced Linux Sound Architecture (ALSA). A local user who had the ability to read the /proc/driver/snd-page-alloc file could see portions of kernel memory. (CVE-2007-4571, Moderate) - A flaw was found in the aacraid SCSI driver. This allowed a local user to make ioctl calls to the driver that should be restricted to privileged users. (CVE-2007-4308, Moderate) - A flaw was found in the stack expansion when using the hugetlb kernel on PowerPC systems. This allowed a local user to cause a denial of service. (CVE-2007-3739, Moderate) - A flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped which could lead to a denial of service. (CVE-2006-6921, Moderate) - A flaw was found in the CIFS file system handling. The mount option
    last seen2020-06-01
    modified2020-06-02
    plugin id60280
    published2012-08-01
    reporterThis script is Copyright (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/60280
    titleScientific Linux Security Update : kernel on SL4.x i386/x86_64
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2007-0939.NASL
    descriptionUpdated kernel packages that fix various security issues in the Red Hat Enterprise Linux 4 kernel are now available. This update has been rated as having important security impact by the Red Hat Security Response Team. The Linux kernel is the core of the operating system. These updated kernel packages contain fixes for the following security issues : * A flaw was found in the handling of process death signals. This allowed a local user to send arbitrary signals to the suid-process executed by that user. A successful exploitation of this flaw depends on the structure of the suid-program and its signal handling. (CVE-2007-3848, Important) * A flaw was found in the CIFS file system. This could cause the umask values of a process to not be honored on CIFS file systems where UNIX extensions are supported. (CVE-2007-3740, Important) * A flaw was found in the VFAT compat ioctl handling on 64-bit systems. This allowed a local user to corrupt a kernel_dirent struct and cause a denial of service. (CVE-2007-2878, Important) * A flaw was found in the Advanced Linux Sound Architecture (ALSA). A local user who had the ability to read the /proc/driver/snd-page-alloc file could see portions of kernel memory. (CVE-2007-4571, Moderate) * A flaw was found in the aacraid SCSI driver. This allowed a local user to make ioctl calls to the driver that should be restricted to privileged users. (CVE-2007-4308, Moderate) * A flaw was found in the stack expansion when using the hugetlb kernel on PowerPC systems. This allowed a local user to cause a denial of service. (CVE-2007-3739, Moderate) * A flaw was found in the handling of zombie processes. A local user could create processes that would not be properly reaped which could lead to a denial of service. (CVE-2006-6921, Moderate) * A flaw was found in the CIFS file system handling. The mount option
    last seen2020-06-01
    modified2020-06-02
    plugin id27616
    published2007-11-02
    reporterThis script is Copyright (C) 2007-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/27616
    titleRHEL 4 : kernel (RHSA-2007:0939)

Oval

accepted2013-04-29T04:09:11.692-04:00
classvulnerability
contributors
  • nameAharon Chernin
    organizationSCAP.com, LLC
  • nameDragos Prisaca
    organizationG2, Inc.
definition_extensions
  • commentThe operating system installed on the system is Red Hat Enterprise Linux 4
    ovaloval:org.mitre.oval:def:11831
  • commentCentOS Linux 4.x
    ovaloval:org.mitre.oval:def:16636
  • commentOracle Linux 4.x
    ovaloval:org.mitre.oval:def:15990
  • commentThe operating system installed on the system is Red Hat Enterprise Linux 5
    ovaloval:org.mitre.oval:def:11414
  • commentThe operating system installed on the system is CentOS Linux 5.x
    ovaloval:org.mitre.oval:def:15802
  • commentOracle Linux 5.x
    ovaloval:org.mitre.oval:def:15459
descriptionUnspecified versions of the Linux kernel allow local users to cause a denial of service (unrecoverable zombie process) via a program with certain instructions that prevent init from properly reaping a child whose parent has died.
familyunix
idoval:org.mitre.oval:def:10834
statusaccepted
submitted2010-07-09T03:56:16-04:00
titleUnspecified versions of the Linux kernel allow local users to cause a denial of service (unrecoverable zombie process) via a program with certain instructions that prevent init from properly reaping a child whose parent has died.
version27

Redhat

advisories
  • rhsa
    idRHSA-2007:0939
  • rhsa
    idRHSA-2008:0154
rpms
  • kernel-0:2.6.9-55.0.12.EL
  • kernel-debuginfo-0:2.6.9-55.0.12.EL
  • kernel-devel-0:2.6.9-55.0.12.EL
  • kernel-doc-0:2.6.9-55.0.12.EL
  • kernel-hugemem-0:2.6.9-55.0.12.EL
  • kernel-hugemem-devel-0:2.6.9-55.0.12.EL
  • kernel-largesmp-0:2.6.9-55.0.12.EL
  • kernel-largesmp-devel-0:2.6.9-55.0.12.EL
  • kernel-smp-0:2.6.9-55.0.12.EL
  • kernel-smp-devel-0:2.6.9-55.0.12.EL
  • kernel-xenU-0:2.6.9-55.0.12.EL
  • kernel-xenU-devel-0:2.6.9-55.0.12.EL
  • kernel-0:2.6.18-53.1.14.el5
  • kernel-PAE-0:2.6.18-53.1.14.el5
  • kernel-PAE-debuginfo-0:2.6.18-53.1.14.el5
  • kernel-PAE-devel-0:2.6.18-53.1.14.el5
  • kernel-debug-0:2.6.18-53.1.14.el5
  • kernel-debug-debuginfo-0:2.6.18-53.1.14.el5
  • kernel-debug-devel-0:2.6.18-53.1.14.el5
  • kernel-debuginfo-0:2.6.18-53.1.14.el5
  • kernel-debuginfo-common-0:2.6.18-53.1.14.el5
  • kernel-devel-0:2.6.18-53.1.14.el5
  • kernel-doc-0:2.6.18-53.1.14.el5
  • kernel-headers-0:2.6.18-53.1.14.el5
  • kernel-kdump-0:2.6.18-53.1.14.el5
  • kernel-kdump-debuginfo-0:2.6.18-53.1.14.el5
  • kernel-kdump-devel-0:2.6.18-53.1.14.el5
  • kernel-xen-0:2.6.18-53.1.14.el5
  • kernel-xen-debuginfo-0:2.6.18-53.1.14.el5
  • kernel-xen-devel-0:2.6.18-53.1.14.el5

Statements

contributorMark J Cox
lastmodified2007-10-18
organizationRed Hat
statementThis issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 2.1 or 3.