Mismatched Memory Management Routines in Linux kernel - CVE-2026-89502
Published: September 12, 2026
Vulnerability identifier: #VU149302
CSH Severity: Low
CVSS v4: 4.8 [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]
CVE-ID: CVE-2026-89502
CWE-ID: CWE-762
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a memory leak.
The vulnerability exists due to mismatched memory management routines in the ring buffer CPU buffer cleanup routine when freeing cpu_buffer->free_page allocated with a sub-buffer order greater than zero. A local user can trigger cleanup of an affected CPU buffer to cause a memory leak.
Affected software
Linux kernel
How to mitigate CVE-2026-89502
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3