Vulnerabilities > CVE-2020-12657 - Use After Free vulnerability in Linux Kernel
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Nessus
NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-2429.NASL description The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:2429 advisory. - kernel: powerpc: incomplete Spectre-RSB mitigation leads to information exposure (CVE-2019-18660) - Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic (CVE-2020-10711) - Kernel: s390: page table upgrade in secondary address mode may lead to privilege escalation (CVE-2020-11884) - kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body (CVE-2020-12657) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-12 modified 2020-06-09 plugin id 137275 published 2020-06-09 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/137275 title RHEL 8 : kernel (RHSA-2020:2429) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-2427.NASL description The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2020:2427 advisory. - kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body (CVE-2020-12657) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-12 modified 2020-06-09 plugin id 137278 published 2020-06-09 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/137278 title RHEL 8 : kernel (RHSA-2020:2427) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4368-1.NASL description Tristan Madani discovered that the file locking implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service or expose sensitive information. (CVE-2019-19769) It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-11494) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the OV51x USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11608) It was discovered that the STV06XX USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11609) It was discovered that the Xirlink C-It USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11668) David Gibson discovered that the Linux kernel on Power9 CPUs did not properly save and restore Authority Mask registers state in some situations. A local attacker in a guest VM could use this to cause a denial of service (host system crash). (CVE-2020-11669) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-31 modified 2020-05-20 plugin id 136733 published 2020-05-20 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136733 title Ubuntu 18.04 LTS : linux-gke-5.0, linux-oem-osp1 vulnerabilities (USN-4368-1) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4363-1.NASL description It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-11494) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) David Gibson discovered that the Linux kernel on Power9 CPUs did not properly save and restore Authority Mask registers state in some situations. A local attacker in a guest VM could use this to cause a denial of service (host system crash). (CVE-2020-11669) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-31 modified 2020-05-19 plugin id 136710 published 2020-05-19 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136710 title Ubuntu 16.04 LTS / 18.04 LTS : linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gke-4.15, linux-hwe, (USN-4363-1) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2020-1592.NASL description According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A flaw was found in the Linux kernel last seen 2020-06-11 modified 2020-05-26 plugin id 136870 published 2020-05-26 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136870 title EulerOS 2.0 SP8 : kernel (EulerOS-SA-2020-1592) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-2428.NASL description The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2020:2428 advisory. - kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body (CVE-2020-12657) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-12 modified 2020-06-09 plugin id 137274 published 2020-06-09 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/137274 title RHEL 8 : kernel-rt (RHSA-2020:2428) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2020-5714.NASL description Description of changes: [5.4.17-2011.3.2.1.el8uek] - x86/speculation: Add Ivy Bridge to affected list (Josh Poimboeuf) [Orabug: 31352779] {CVE-2020-0543} - x86/speculation: Add SRBDS vulnerability and mitigation documentation (Mark Gross) [Orabug: 31352779] {CVE-2020-0543} - x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation (Mark Gross) [Orabug: 31352779] {CVE-2020-0543} - x86/cpu: Add last seen 2020-06-13 modified 2020-06-10 plugin id 137290 published 2020-06-10 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/137290 title Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2020-5714) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4367-1.NASL description It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-31 modified 2020-05-20 plugin id 136732 published 2020-05-20 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136732 title Ubuntu 20.04 : linux, linux-aws, linux-gcp, linux-kvm, linux-oracle, linux-riscv (USN-4367-1) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4367-2.NASL description USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately, that update introduced a regression in overlayfs. This update corrects the problem. We apologize for the inconvenience. Original advisory details : It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-06 modified 2020-05-29 plugin id 136965 published 2020-05-29 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136965 title Ubuntu 20.04 : linux regression (USN-4367-2) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2020-2427.NASL description From Red Hat Security Advisory 2020:2427 : The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2020:2427 advisory. - kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body (CVE-2020-12657) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-13 modified 2020-06-12 plugin id 137384 published 2020-06-12 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/137384 title Oracle Linux 8 : kernel (ELSA-2020-2427) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4369-2.NASL description USN-4369-1 fixed vulnerabilities in the 5.3 Linux kernel. Unfortunately, that update introduced a regression in overlayfs. This update corrects the problem. We apologize for the inconvenience. Original advisory details : It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377) Tristan Madani discovered that the file locking implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service or expose sensitive information. (CVE-2019-19769) It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-11494) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the OV51x USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11608) It was discovered that the STV06XX USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11609) It was discovered that the Xirlink C-It USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11668) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-06 modified 2020-05-29 plugin id 136966 published 2020-05-29 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136966 title Ubuntu 18.04 LTS / 19.10 : linux, linux-raspi2, linux-raspi2-5.3 regression (USN-4369-2) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4369-1.NASL description It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377) Tristan Madani discovered that the file locking implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service or expose sensitive information. (CVE-2019-19769) It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-11494) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the OV51x USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11608) It was discovered that the STV06XX USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11609) It was discovered that the Xirlink C-It USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11668) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-31 modified 2020-05-21 plugin id 136759 published 2020-05-21 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136759 title Ubuntu 18.04 LTS / 19.10 : linux, linux-aws, linux-aws-5.3, linux-gcp, linux-gcp-5.3, linux-gke-5.3, (USN-4369-1)
Redhat
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References
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- https://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- https://patchwork.kernel.org/patch/11447049/
- https://security.netapp.com/advisory/ntap-20200608-0001/
- https://usn.ubuntu.com/4363-1/
- https://usn.ubuntu.com/4367-1/
- https://usn.ubuntu.com/4368-1/
- https://usn.ubuntu.com/4369-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
- https://usn.ubuntu.com/4369-1/
- https://usn.ubuntu.com/4368-1/
- https://usn.ubuntu.com/4367-1/
- https://usn.ubuntu.com/4363-1/
- https://security.netapp.com/advisory/ntap-20200608-0001/
- https://patchwork.kernel.org/patch/11447049/
- https://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5