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Unrated severityNVD Advisory· Published Jul 29, 2024· Updated Jan 5, 2026

btrfs: qgroup: fix quota root leak after quota disable failure

CVE-2024-41078

Description

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

btrfs: qgroup: fix quota root leak after quota disable failure

If during the quota disable we fail when cleaning the quota tree or when deleting the root from the root tree, we jump to the 'out' label without ever dropping the reference on the quota root, resulting in a leak of the root since fs_info->quota_root is no longer pointing to the root (we have set it to NULL just before those steps).

Fix this by always doing a btrfs_put_root() call under the 'out' label. This is a problem that exists since qgroups were first added in 2012 by commit bed92eae26cc ("Btrfs: qgroup implementation and prototypes"), but back then we missed a kfree on the quota root and free_extent_buffer() calls on its root and commit root nodes, since back then roots were not yet reference counted.

Affected products

120

Patches

6
5ef3961682e5
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
8a69529f2259
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
94818bdb00ef
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
a7e4c6a3031c
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
7dd6a5b96157
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
f88aeff5a173
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

6

News mentions

0

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