Memory leak in Linux kernel - CVE-2026-89645
Published: September 12, 2026
Vulnerability identifier: #VU149158
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89645
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a reference leak.
The vulnerability exists due to improper reference counting in btrfs relocation recovery when handling recovery failures. A local user can trigger a relocation recovery failure to cause a reference leak.
The issue occurs if loading or adding a later root fails, or if the first transaction commit fails during relocation recovery.
Affected software
Linux kernel
How to mitigate CVE-2026-89645
Install security update from vendor's repository.