CVE-2021-4159
mediumA vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures.
Vendor / product: Linux — linux kernel
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
4.4
4.4 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2022-08-24 16:15
Modified: 2026-11-02 19:17
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-11-03 07:33 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
linux / linux_kernel <5.7
redhat / enterprise_linux 8.0
debian / debian_linux 10.0
Weakness classification (CWE)
CWE-202 NVD-CWE-Other
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd
Vendor advisory: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd
References
- https://access.redhat.com/security/cve/CVE-2021-4159 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2036024 secalert@redhat.com
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27... secalert@redhat.com
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html secalert@redhat.com
- https://security-tracker.debian.org/tracker/CVE-2021-4159 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2021-4159 af854a3a-2127-422b-91ae-364da2661108
- https://bugzilla.redhat.com/show_bug.cgi?id=2036024 af854a3a-2127-422b-91ae-364da2661108
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27... af854a3a-2127-422b-91ae-364da2661108
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html af854a3a-2127-422b-91ae-364da2661108
- https://security-tracker.debian.org/tracker/CVE-2021-4159 af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:33 UTC · record ↗