# CVE-2024-42149: linux: In the Linux kernel, the following vulnerability has been resolved:  fs: don't misleadingly warn during thaw operatio...

CVE-2024-42149 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42149, released July 30, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-42149
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 30, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  fs: don't misleadingly warn during thaw operations  The block device may have been frozen before it was claimed by a filesystem. Concurrently another process might try to mount that frozen block device and has temporarily claimed the block device for that purpose causing a concurrent fs_bdev_thaw() to end up here. The mounter is already about to abort mounting because they still saw an elevanted bdev->bd_fsfreeze_count so get_bdev_super() will return NULL in that case.  For example, P1 calls dm_suspend() which calls into bdev_freeze() before the block device has been claimed by the filesystem. This brings bdev->bd_fsfreeze_count to 1 and no call into fs_bdev_freeze() is required.  Now P2 tries to mount that frozen block device. It claims it and checks bdev->bd_fsfreeze_count. As it's elevated it aborts mounting.  In the meantime P3 called dm_resume(). P3 sees that the block device is already claimed by a filesystem and calls into fs_bdev_thaw().  P3 takes a passive reference and realizes that the filesystem isn't ready yet. P3 puts itself to sleep to wait for the filesystem to become ready.  P2 now puts the last active reference to the filesystem and marks it as dying. P3 gets woken, sees that the filesystem is dying and get_bdev_super() fails.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.9-1 | [DEBIAN-CVE-2024-42149](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42149.md) | Jul 30, 2024 |
| Linux | linux Debian 14 | 6.9.9-1 | [DEBIAN-CVE-2024-42149](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42149.md) | Jul 30, 2024 |

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