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🛡️ CVE-2024-44963 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

btrfs: do not BUG_ON() when freeing tree block after error

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

btrfs: do not BUG_ON() when freeing tree block after error

When freeing a tree block, at btrfs_free_tree_block(), if we fail to

create a delayed reference we don't deal with the error and just do a

BUG_ON(). The error most likely to happen is -ENOMEM, and we have a

comment mentioning that only -ENOMEM can happen, but that is not true,

because in case qgroups are enabled any error returned from

btrfs_qgroup_trace_extent_post() (can be -EUCLEAN or anything returned

from btrfs_search_slot() for example) can be propagated back to

btrfs_free_tree_block().

So stop doing a BUG_ON() and return the error to the callers and make

them abort the transaction to prevent leaking space. Syzbot was

triggering this, likely due to memory allocation failure injection.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2024-44963 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.10.5)
  • linux-kernel (fixed in 6.10.5)

Timeline and source

Published on 4 September 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2024-44963 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-09-04
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.10.5
linux-kernel — 6.10.5

Similar Threats

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