Use-after-free in Linux kernel - CVE-2026-89746
Published: September 12, 2026
Vulnerability identifier: #VU149057
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89746
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the Linux kernel trace event histogram trigger handling when a hist trigger references a variable after same-name named triggers have been registered. A local user can write crafted hist triggers to tracefs to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89746
Install security update from vendor's repository.