Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64556
Published: July 30, 2026
Vulnerability identifier: #VU140102
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64556
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt kernel memory.
The vulnerability exists due to improper state management in perf_event_remove_on_exec() and event group handling in the perf subsystem when removing events marked remove_on_exec. A local user can trigger event removal for a group leader with surviving siblings to corrupt kernel memory.
The issue occurs when a removed event is a group leader and sibling events without remove_on_exec remain active in a stale group state.
Affected software
Linux kernel
How to mitigate CVE-2026-64556
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/037a3c43edfb597665dd34457cd22b14692f2ba3
- https://git.kernel.org/stable/c/06ccef0434e98058ddae7bcebc901f93d22b7653
- https://git.kernel.org/stable/c/39358e856fb89e62e3c8d7389a2dc4ec33dbe90e
- https://git.kernel.org/stable/c/4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2
- https://git.kernel.org/stable/c/a2d5d3ee7b6e3953114726b1521e62123ab5b043