Riskcovery

CVE-2022-50746

erofs: validate the extent length for uncompressed pclusters

State
Published
Severity
8.4 High
Published
Dec 24, 2025
Updated
Oct 15, 2026
Reserved
Dec 24, 2025

Read the record on cve.org

Description

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

erofs: validate the extent length for uncompressed pclusters

syzkaller reported a KASAN use-after-free: https://syzkaller.appspot.com/bug?extid=2ae90e873e97f1faf6f2

The referenced fuzzed image actually has two issues: - m_pa == 0 as a non-inlined pcluster; - The logical length is longer than its physical length.

The first issue has already been addressed. This patch addresses the second issue by checking the extent length validity.

Scores

CVSSScoreVectorSource
3.18.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 02827e1796b33f1794966f5c3101f8da2dfa9c1d to before dc8b6bd587b13b85aff6e9d36cdfcd3f955cac9eAffected
  • 02827e1796b33f1794966f5c3101f8da2dfa9c1d to before 40c73b2ea9611b5388807be406f30f5e4e1162daAffected
  • 02827e1796b33f1794966f5c3101f8da2dfa9c1d to before c505feba4c0d76084e56ec498ce819f02a7043aeAffected
LinuxLinux
  • 4.19Affected
  • before 4.19Not affected
  • 6.0.16 through 6.0.*Not affected
  • 6.1.2 through 6.1.*Not affected
  • 6.2 and laterNot affected

References

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