PT-2026-5539 · Btrfs+1 · Btrfs+1
Syzbot
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Published
2026-01-01
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Updated
2026-01-31
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CVE-2026-23036
CVSS v2.0
4.3
Medium
| Vector | AV:A/AC:H/Au:S/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a flaw in the btrfs subsystem related to inode handling. Specifically, in
btrfs read locked inode(), if inode lookup fails, a path with a read-locked leaf is released before iget failed() is called. This can lead to a deadlock situation involving inode eviction and updates to the subvolume btree. A lockdep splat was reported by Syzbot, indicating a potential circular locking dependency. The issue arises when releasing a delayed node's mutex while a task is already holding a lock on the btrfs tree. This can occur during inode eviction, which requires locking the delayed inode's mutex, while a task updating a delayed inode starts by taking the node's mutex and modifying the inode's subvolume btree.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel
Btrfs