Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-43090
Published: May 7, 2026
Vulnerability identifier: #VU130667
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43090
CWE-ID: CWE-772
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a refcount leak in xfrm_migrate_policy_find when handling policy migration lookups. A local user can trigger the vulnerable code path to cause a denial of service.
The issue is caused by a redundant reference increment because the lookup function already returns a policy with a held reference.
How to mitigate CVE-2026-43090
Install security update from vendor's repository.