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CVE-2021-4159

4.4 · MEDIUM

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

Published Aug 24, 2022CWE-202EPSS 0.25%

Overview

CVE-2021-4159 is a medium-severity vulnerability. It was published on August 24, 2022 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/security/cve/CVE-2021-4159Refbugzilla.redhat.com/show_bug.cgi?id=2036024Refgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bdReflists.debian.org/debian-lts-announce/2022/10/msg00000.htmlRefsecurity-tracker.debian.org/tracker/CVE-2021-4159Refaccess.redhat.com/security/cve/CVE-2021-4159Refbugzilla.redhat.com/show_bug.cgi?id=2036024Refgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bdReflists.debian.org/debian-lts-announce/2022/10/msg00000.htmlRefsecurity-tracker.debian.org/tracker/CVE-2021-4159

How CyberStrike helps

Frequently asked questions

What is CVE-2021-4159?

CVE-2021-4159 is a medium-severity vulnerability. It was published on August 24, 2022 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

How severe is CVE-2021-4159?

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-4159?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-4159?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-4159 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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