CVE-2024-27058: tmpfs: fix race on handling dquot rbtree
First published: Wed May 01 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.6<6.6.24 | |
| Linux Kernel | >=6.7<6.7.12 | |
| Linux Kernel | >=6.8<6.8.3 | |
| Linux Kernel | =6.9-rc1 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2
- https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb
- https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0
- https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810
- https://launchpad.net/bugs/cve/CVE-2024-27058
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-27058
- https://nvd.nist.gov/vuln/detail/CVE-2024-27058
- https://security-tracker.debian.org/tracker/CVE-2024-27058
- https://ubuntu.com/security/CVE-2024-27058
- https://git.kernel.org/linus/0a69b6b3a026543bc215ccc866d0aea5579e6ce2
Frequently Asked Questions
What is the severity of CVE-2024-27058?
CVE-2024-27058 is considered a medium severity vulnerability due to a race condition in the Linux kernel's handling of dquot information.
How do I fix CVE-2024-27058?
To fix CVE-2024-27058, update your Linux kernel to one of the following versions: 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.119-1, 6.12.10-1, or 6.12.11-1.
Which software is affected by CVE-2024-27058?
CVE-2024-27058 affects the Linux package in Debian versions as specified in the patched updates.
What is a race condition in CVE-2024-27058?
A race condition in CVE-2024-27058 occurs when multiple processes attempt to modify dquot information in the rb tree simultaneously, potentially leading to inconsistent states.
Is CVE-2024-27058 exploitable?
Yes, CVE-2024-27058 can be potentially exploited in scenarios where attackers can trigger the race condition during dquot operations.
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