CVE-2022-50379

MediumCVSS 4.7/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 4.7/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-362

Affected software

VendorProductVersions
LinuxLinux>= 5d23515be66904fa3b1b5d6bd72d2199cd2447ab, < c97f6d528c3f1c83a6b792a8a7928c236c80b8fe; >= 5d23515be66904fa3b1b5d6bd72d2199cd2447ab, < 26b7c0ac49a3eea15559c9d84863736a6d1164b4; >= 5d23515be66904fa3b1b5d6bd72d2199cd2447ab, < 47b5ffe86332af95f0f52be0a63d4da7c2b37b55; >= 5d23515be66904fa3b1b5d6bd72d2199cd2447ab, < 4b996a3014ef014af8f97b60c35f5289210a4720; >= 5d23515be66904fa3b1b5d6bd72d2199cd2447ab, < 0efd9dfc00d677a1d0929319a6103cb2dfc41c22; >= 5d23515be66904fa3b1b5d6bd72d2199cd2447ab, < 6c22f86dd221eba0c7af645b1af73dcbc04ee27b; >= 5d23515be66904fa3b1b5d6bd72d2199cd2447ab, < 331cd9461412e103d07595a10289de90004ac890
LinuxLinux4.17

References

Timeline

Published
Sep 18, 2025
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2022-50379: Medium severity, CVSS 4.7 | Vulnix