# CVE-2024-27058: linux: In the Linux kernel, the following vulnerability has been resolved:  tmpfs: fix race on handling dquot rbtree  A syzk...

CVE-2024-27058 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-27058, released May 1, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-27058
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0039
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  tmpfs: fix race on handling dquot rbtree  A syzkaller reproducer found a race while attempting to remove dquot information from the rb tree.  Fetching the rb_tree root node must also be protected by the dqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot() will trigger a warning because it couldn't find a node in the tree, when the real reason was the root node changing before the search starts:  Thread 1				Thread 2 - shmem_release_dquot()			- shmem_{acquire,release}_dquot()  - fetch ROOT				- Fetch ROOT  					- acquire dqio_sem - wait dqio_sem  					- do something, triger a tree rebalance 					- release dqio_sem  - acquire dqio_sem - start searching for the node, but   from the wrong location, missing   the node, and triggering a warning.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.7.12-1 | [DEBIAN-CVE-2024-27058](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27058.md) | May 1, 2024 |
| Linux | linux Debian 14 | 6.7.12-1 | [DEBIAN-CVE-2024-27058](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27058.md) | May 1, 2024 |

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