Medium 5.5Published Nov 7, 2024

CVE-2024-50142xfrm: validate new SA's prefixlen using SA family when sel.family is unset

Updated under an hour ago (Oct 28, 2026, 7:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f31398570acf0f0804c644006f7bfa9067106b0a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 401ad99a5ae7180dd9449eac104cb755f442e7f3; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before bce1afaa212ec380bf971614f70909a27882b862; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7d9868180bd1e4cf37e7c5067362658971162366; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e68dd80ba498265d2266b12dc3459164f4ff0c4a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1.1	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12 before 4.19.323; from 4.20 before 5.4.285; from 5.5 before 5.10.229; from 5.11 before 5.15.170; from 5.16 before 6.1.115; from 6.2 before 6.6.59; from 6.7 before 6.11.6; 6.12; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/f31398570acf0f0804c644006f7bfa9067106b0a	patch
https://git.kernel.org/stable/c/401ad99a5ae7180dd9449eac104cb755f442e7f3	patch
https://git.kernel.org/stable/c/8df5cd51fd70c33aa1776e5cbcd82b0a86649d73	patch
https://git.kernel.org/stable/c/2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71	patch
https://git.kernel.org/stable/c/bce1afaa212ec380bf971614f70909a27882b862	patch
https://git.kernel.org/stable/c/7d9868180bd1e4cf37e7c5067362658971162366	patch
https://git.kernel.org/stable/c/e68dd80ba498265d2266b12dc3459164f4ff0c4a	patch
https://git.kernel.org/stable/c/3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563	patch
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.