CVE-2024-50142: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	2.6.12 — 4.19.323
linux	linux_kernel	4.20 — 5.4.285
linux	linux_kernel	5.5 — 5.10.229
linux	linux_kernel	5.11 — 5.15.170
linux	linux_kernel	5.16 — 6.1.115
linux	linux_kernel	6.2 — 6.6.59
linux	linux_kernel	6.7 — 6.11.6
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71 https://git.kernel.org/stable/c/3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 https://git.kernel.org/stable/c/401ad99a5ae7180dd9449eac104cb755f442e7f3 https://git.kernel.org/stable/c/7d9868180bd1e4cf37e7c5067362658971162366 https://git.kernel.org/stable/c/8df5cd51fd70c33aa1776e5cbcd82b0a86649d73 https://git.kernel.org/stable/c/bce1afaa212ec380bf971614f70909a27882b862 https://git.kernel.org/stable/c/e68dd80ba498265d2266b12dc3459164f4ff0c4a https://git.kernel.org/stable/c/f31398570acf0f0804c644006f7bfa9067106b0a

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Frequently Asked Questions

What is CVE-2024-50142? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-50142? +

CVE-2024-50142 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-50142? +

CVE-2024-50142 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-50142? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-50142