CVE-2024-41078: btrfs: qgroup: fix quota root leak after quota disable failure
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 fsinfo->quotaroot is no longer pointing to the root (we have set it to NULL just before those steps).
Fix this by always doing a btrfsputroot() 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 freeextentbuffer() calls on its root and commit root nodes, since back then roots were not yet reference counted.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-41078?
CVE-2024-41078 has a medium severity level due to potential resource leakage in the Linux kernel's btrfs subsystem.
How do I fix CVE-2024-41078?
To fix CVE-2024-41078, upgrade to the patched versions of Linux kernel listed in the advisory.
Which Linux kernel versions are affected by CVE-2024-41078?
CVE-2024-41078 affects various versions of the Linux kernel prior to the patched releases specified in the Debian advisories.
What is the impact of CVE-2024-41078?
The impact of CVE-2024-41078 can lead to a quota root leak, which may allow unauthorized resource access.
Is CVE-2024-41078 specific to btrfs file system?
Yes, CVE-2024-41078 specifically pertains to the btrfs file system's quota management in the Linux kernel.