Incorrect behavior order in Linux kernel - CVE-2026-90261
Published: September 18, 2026
Vulnerability identifier: #VU151223
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90261
CWE-ID: CWE-696
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to incorrect behavior order in btrfs btree_writepages() writeback handling when committing transactions on a zoned filesystem with dirty metadata in block groups below the active block group. A local user can trigger metadata-heavy relocation to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-90261
Install security update from vendor's repository.