Home/CVE/A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory lo
CVE

CVE-2021-4159

A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory lo

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.

MEDIUM · CVSS 4.4 EPSS 0.0007
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-202Exposure of Sensitive Information Through Data Queries
▤

Affected Products & Versions

3
linux kernel< 5.7
redhat enterprise linuxall versions
debian linuxall versions
▣

Scoring & Timeline

4.4
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Aug 2022 · 04:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
⚑

Vendor Advisories

13
suse-csafSUSE-SU-2025:01983-1
usnUSN-5790-1
usnUSN-5706-1
usnUSN-5682-1
usnUSN-5677-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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 ListPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing ListThird Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-4159Third Party Advisory
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