CVE-2022-50379
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…
Does this matter?
Lower severity and a low EPSS score (0.11%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.11% probability · 1th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0efd9dfc00d677a1d0929319a6103cb2dfc41c22Patch
- https://git.kernel.org/stable/c/26b7c0ac49a3eea15559c9d84863736a6d1164b4Patch
- https://git.kernel.org/stable/c/331cd9461412e103d07595a10289de90004ac890Patch
- https://git.kernel.org/stable/c/47b5ffe86332af95f0f52be0a63d4da7c2b37b55Patch
- https://git.kernel.org/stable/c/4b996a3014ef014af8f97b60c35f5289210a4720Patch
- https://git.kernel.org/stable/c/6c22f86dd221eba0c7af645b1af73dcbc04ee27bPatch
- https://git.kernel.org/stable/c/c97f6d528c3f1c83a6b792a8a7928c236c80b8fePatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.