CVE-2021-4159
MEDIUM severity · CVSS 4.4 · CWE-202
4.4CVSS MEDIUM
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredHigh
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Affected products we track (3)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd ↗
Additional information
- NVD record
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bdPatch
- https://access.redhat.com/security/cve/CVE-2021-4159Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2036024
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlAdvisory
- https://security-tracker.debian.org/tracker/CVE-2021-4159Advisory