VulnerabilityModified
CVE-2021-4159
A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures.
MEDIUM 4.4EPSS 0.25%
Does this matter?
Lower severity and a low EPSS score (0.25%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.25% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-202
- Affected
- linux/linux kernel · redhat/enterprise linux · debian/debian linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2021-4159Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2036024Issue Tracking
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bdMailing List, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing List, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-4159Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-4159Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2036024Issue Tracking
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bdMailing List, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing List, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-4159Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.