CVE-2024-50142

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

State: Published
Severity: 5.5 Medium
Published: Nov 7, 2024
Updated: Oct 15, 2026
Reserved: Oct 21, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f31398570acf0f0804c644006f7bfa9067106b0aAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 401ad99a5ae7180dd9449eac104cb755f442e7f3Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bce1afaa212ec380bf971614f70909a27882b862Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7d9868180bd1e4cf37e7c5067362658971162366Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e68dd80ba498265d2266b12dc3459164f4ff0c4aAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 4.19.323 through 4.19.Not affected 5.4.285 through 5.4.Not affected 5.10.229 through 5.10.Not affected 5.15.170 through 5.15.Not affected 6.1.115 through 6.1.Not affected 6.6.59 through 6.6.Not affected 6.11.6 through 6.11.*Not affected 6.12 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f31398570acf0f0804c644006f7bfa9067106b0aAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 401ad99a5ae7180dd9449eac104cb755f442e7f3Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bce1afaa212ec380bf971614f70909a27882b862Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7d9868180bd1e4cf37e7c5067362658971162366Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e68dd80ba498265d2266b12dc3459164f4ff0c4aAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
4.19.323 through 4.19.*Not affected
5.4.285 through 5.4.*Not affected
5.10.229 through 5.10.*Not affected
5.15.170 through 5.15.*Not affected
6.1.115 through 6.1.*Not affected
6.6.59 through 6.6.*Not affected
6.11.6 through 6.11.*Not affected
6.12 and laterNot affected

References

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