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CVE-2024-50142

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: xfrm: validate new SA's prefixlen using SA family when sel.family is unset This expands the validation introduced in commit 07b…

Published Nov 7, 2024EPSS 0.26%

Overview

CVE-2024-50142 is a medium-severity vulnerability. It was published on November 7, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

xfrm: validate new SA's prefixlen using SA family when sel.family is unset

This expands the validation introduced in commit 07bf7908950a ("xfrm:

Validate address prefix lengths in the xfrm selector.")

syzbot created an SA with

usersa.sel.family = AF_UNSPEC

usersa.sel.prefixlen_s = 128

usersa.family = AF_INET

Because of the AF_UNSPEC selector, verify_newsa_info doesn't put

limits on prefixlen_{s,d}. But then copy_from_user_state sets

x->sel.family to usersa.family (AF_INET). Do the same conversion in

verify_newsa_info before validating prefixlen_{s,d}, since that's how

prefixlen is going to be used later on.

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

Refgit.kernel.org/stable/c/2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71Refgit.kernel.org/stable/c/3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563Refgit.kernel.org/stable/c/401ad99a5ae7180dd9449eac104cb755f442e7f3Refgit.kernel.org/stable/c/7d9868180bd1e4cf37e7c5067362658971162366Refgit.kernel.org/stable/c/8df5cd51fd70c33aa1776e5cbcd82b0a86649d73Refgit.kernel.org/stable/c/bce1afaa212ec380bf971614f70909a27882b862Refgit.kernel.org/stable/c/e68dd80ba498265d2266b12dc3459164f4ff0c4aRefgit.kernel.org/stable/c/f31398570acf0f0804c644006f7bfa9067106b0aReflists.debian.org/debian-lts-announce/2025/01/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-50142?

CVE-2024-50142 is a medium-severity vulnerability. It was published on November 7, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-50142?

This vulnerability has a CVSS 3.1 base score of 5.5, 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-2024-50142?

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-2024-50142?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-50142 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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