CVE-2024-27058
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.39% probability · 32th 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/0a69b6b3a026543bc215ccc866d0aea5579e6ce2Patch
- https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bbPatch
- https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0Patch
- https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810Patch
- https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2Patch
- https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bbPatch
- https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0Patch
- https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.