CVE-2022-50746

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux02827e1796b33f1794966f5c3101f8da2dfa9c1d < dc8b6bd587b13b85aff6e9d36cdfcd3f955cac9eaffected
LinuxLinux02827e1796b33f1794966f5c3101f8da2dfa9c1d < 40c73b2ea9611b5388807be406f30f5e4e1162daaffected
LinuxLinux02827e1796b33f1794966f5c3101f8da2dfa9c1d < c505feba4c0d76084e56ec498ce819f02a7043aeaffected
LinuxLinux4.19affected
LinuxLinux0 < 4.19unaffected
LinuxLinux6.0.16 <= 6.0.*unaffected
LinuxLinux6.1.2 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

References