Memory leak in Linux kernel - CVE-2026-53261
Published: June 26, 2026
Vulnerability identifier: #VU135483
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-2026-53261
CWE-ID: CWE-401
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 memory leak in devlink_free() when freeing an unregistered devlink instance with a nested relation. A local user can trigger a probe failure after creating such a relation to cause a denial of service.
This can occur when a child devlink is linked to its parent before registration and the probe later fails.
How to mitigate CVE-2026-53261
Install security update from vendor's repository.