CVE-2024-42306: udf: Avoid using corrupted block bitmap buffer

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-08-17 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: udf: Avoid using corrupted block bitmap buffer When the filesystem block bitmap is corrupted, we detect the corruption while loading the bitmap and fail the allocation with error. However the next allocation from the same bitmap will notice the bitmap buffer is already loaded and tries to allocate from the bitmap with mixed results (depending on the exact nature of the bitmap corruption). Fix the problem by using BH_verified bit to indicate whether the bitmap is valid or not.

Affected products

Linux kernel: from 4.14.326 before 4.15; from 4.19.295 before 4.20; from 5.4.257 before 5.4.282; from 5.10.195 before 5.10.224; from 5.15.132 before 5.15.165; from 6.1.53 before 6.1.103 — fixed in 4.15, 4.20, 5.10.224, 5.15.165, 5.4.282, 6.1.103

How to fix

Upgrade to a fixed version: Linux kernel 4.15, 4.20, 5.10.224, 5.15.165. Check the vendor advisory for mitigations.

References

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