Vulnerabilities > CVE-2021-4159
Attack vector
LOCAL Attack complexity
LOW Privileges required
HIGH Confidentiality impact
HIGH Integrity impact
NONE Availability impact
NONE Summary
A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.
Vulnerable Configurations
References
- https://access.redhat.com/security/cve/CVE-2021-4159
- https://access.redhat.com/security/cve/CVE-2021-4159
- https://bugzilla.redhat.com/show_bug.cgi?id=2036024
- https://bugzilla.redhat.com/show_bug.cgi?id=2036024
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://security-tracker.debian.org/tracker/CVE-2021-4159
- https://security-tracker.debian.org/tracker/CVE-2021-4159