PT-2026-4475 · Btrfs+1 · Btrfs+1
Published
2025-01-01
·
Updated
2026-01-24
·
CVE-2025-71159
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a flaw within the btrfs subsystem, specifically in the
btrfs get or create delayed node() function. A previous commit altered the order of operations, removing a necessary memory barrier. This change allowed for a potential race condition where a thread could attempt to increment a reference count before it was properly initialized, leading to a refcounting bug and a use-after-free warning. The issue stems from the interaction between setting the reference count for a delayed node and setting the btrfs inode->delayed node pointer. The fix involves restoring the original order of operations to re-establish the necessary memory barrier. The function btrfs get or create delayed node() is involved in the process.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel
Btrfs