Race condition in Linux kernel - CVE-2026-89501
Published: September 12, 2026
Vulnerability identifier: #VU149301
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-2026-89501
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a race condition involving cpu_buffer->free_page.
The vulnerability exists due to improper synchronization in trace ring buffer resizing when changing a sub-buffer order. A local user can race sub-buffer resizing with read-page allocation or freeing operations to cause a race condition involving cpu_buffer->free_page.
Affected software
Linux kernel
How to mitigate CVE-2026-89501
Install security update from vendor's repository.