CVE-2022-50379
btrfs: fix race between quota enable and quota rescan ioctl
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.
INFO
Published Date :
Sept. 18, 2025, 2:15 p.m.
Last Modified :
Sept. 18, 2025, 2:15 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2022-50379
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the kernel patch for btrfs quota race condition.
- Ensure quota rescan initialization handles errors properly.
- Update the Linux kernel to the latest stable version.
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2022-50379.
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associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2022-50379
weaknesses.
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CVE-2022-50379 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2022-50379 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 18, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/0efd9dfc00d677a1d0929319a6103cb2dfc41c22 Added Reference https://git.kernel.org/stable/c/26b7c0ac49a3eea15559c9d84863736a6d1164b4 Added Reference https://git.kernel.org/stable/c/331cd9461412e103d07595a10289de90004ac890 Added Reference https://git.kernel.org/stable/c/47b5ffe86332af95f0f52be0a63d4da7c2b37b55 Added Reference https://git.kernel.org/stable/c/4b996a3014ef014af8f97b60c35f5289210a4720 Added Reference https://git.kernel.org/stable/c/6c22f86dd221eba0c7af645b1af73dcbc04ee27b Added Reference https://git.kernel.org/stable/c/c97f6d528c3f1c83a6b792a8a7928c236c80b8fe