medium
5.5
Advisory Published
Updated

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

First published: Thu Nov 07 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Kernel>=2.6.12<4.19.323
Linux Kernel>=4.20<5.4.285
Linux Kernel>=5.5<5.10.229
Linux Kernel>=5.11<5.15.170
Linux Kernel>=5.16<6.1.115
Linux Kernel>=6.2<6.6.59
Linux Kernel>=6.7<6.11.6
Linux Kernel=6.12-rc1
Linux Kernel=6.12-rc2
Linux Kernel=6.12-rc3
Linux Kernel=6.12-rc4
debian/linux<=5.10.223-1
5.10.234-1
6.1.129-1
6.1.128-1
6.12.20-1
6.12.21-1
debian/linux-6.1
6.1.129-1~deb11u1

Remedy

https://git.kernel.org/stable/c/2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71

Remedy

https://git.kernel.org/stable/c/3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563

Remedy

https://git.kernel.org/stable/c/401ad99a5ae7180dd9449eac104cb755f442e7f3

Remedy

https://git.kernel.org/stable/c/7d9868180bd1e4cf37e7c5067362658971162366

Remedy

https://git.kernel.org/stable/c/8df5cd51fd70c33aa1776e5cbcd82b0a86649d73

Remedy

https://git.kernel.org/stable/c/bce1afaa212ec380bf971614f70909a27882b862

Remedy

https://git.kernel.org/stable/c/e68dd80ba498265d2266b12dc3459164f4ff0c4a

Remedy

https://git.kernel.org/stable/c/f31398570acf0f0804c644006f7bfa9067106b0a

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-50142?

    CVE-2024-50142 has a moderate severity rating due to its potential impact on the Linux kernel's security mechanism.

  • How do I fix CVE-2024-50142?

    To fix CVE-2024-50142, update the Linux kernel to version 6.1.123-1 or higher.

  • Which versions of the Linux kernel are affected by CVE-2024-50142?

    CVE-2024-50142 affects multiple versions of the Linux kernel, including versions between 2.6.12 and 6.12-rc4.

  • Are there any specific distributions that need to patch CVE-2024-50142?

    Yes, Debian distributions need to apply the patch for CVE-2024-50142 in related Linux kernel packages.

  • What is the nature of the vulnerability described in CVE-2024-50142?

    CVE-2024-50142 pertains to improper validation of the new Security Association's prefix length in the Linux kernel's xfrm module.

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