CVE-2022-50379

btrfs: fix race between quota enable and quota rescan ioctl

State: Published
Severity: 4.7 Medium
Published: Sep 18, 2025
Updated: May 11, 2026
Reserved: Sep 17, 2025

Description

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

btrfs: fix race between quota enable and quota rescan ioctl

When enabling quotas, at btrfs_quota_enable(), after committing the transaction, we change fs_info->quota_root to point to the quota root we created and set BTRFS_FS_QUOTA_ENABLED at fs_info->flags. Then we try to start the qgroup rescan worker, first by initializing it with a call to qgroup_rescan_init() - however if that fails we end up freeing the quota root but we leave fs_info->quota_root still pointing to it, this can later result in a use-after-free somewhere else.

We have previously set the flags BTRFS_FS_QUOTA_ENABLED and BTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with -EINPROGRESS at btrfs_quota_enable(), which is possible if someone already called the quota rescan ioctl, and therefore started the rescan worker.

So fix this by ignoring an -EINPROGRESS and asserting we can't get any other error.

Scores

CVSS	Score	Vector	Source
3.1	4.7 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
LinuxLinux	5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before c97f6d528c3f1c83a6b792a8a7928c236c80b8feAffected 5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 26b7c0ac49a3eea15559c9d84863736a6d1164b4Affected 5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 47b5ffe86332af95f0f52be0a63d4da7c2b37b55Affected 5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 4b996a3014ef014af8f97b60c35f5289210a4720Affected 5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 0efd9dfc00d677a1d0929319a6103cb2dfc41c22Affected 5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 6c22f86dd221eba0c7af645b1af73dcbc04ee27bAffected 5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 331cd9461412e103d07595a10289de90004ac890Affected
LinuxLinux	4.17Affected before 4.17Not affected 4.19.262 through 4.19.Not affected 5.4.220 through 5.4.Not affected 5.10.150 through 5.10.Not affected 5.15.75 through 5.15.Not affected 5.19.17 through 5.19.Not affected 6.0.3 through 6.0.Not affected 6.1 and laterNot affected

Product

Versions

LinuxLinux

5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before c97f6d528c3f1c83a6b792a8a7928c236c80b8feAffected
5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 26b7c0ac49a3eea15559c9d84863736a6d1164b4Affected
5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 47b5ffe86332af95f0f52be0a63d4da7c2b37b55Affected
5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 4b996a3014ef014af8f97b60c35f5289210a4720Affected
5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 0efd9dfc00d677a1d0929319a6103cb2dfc41c22Affected
5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 6c22f86dd221eba0c7af645b1af73dcbc04ee27bAffected
5d23515be66904fa3b1b5d6bd72d2199cd2447ab to before 331cd9461412e103d07595a10289de90004ac890Affected

LinuxLinux

4.17Affected
before 4.17Not affected
4.19.262 through 4.19.*Not affected
5.4.220 through 5.4.*Not affected
5.10.150 through 5.10.*Not affected
5.15.75 through 5.15.*Not affected
5.19.17 through 5.19.*Not affected
6.0.3 through 6.0.*Not affected
6.1 and laterNot affected

References

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