Use-after-free in Linux kernel - CVE-2026-89769
Published: September 12, 2026
Vulnerability identifier: #VU149024
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89769
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 use-after-free.
The vulnerability exists due to improper cleanup in the NXP PIT clocksource driver when cpuhp_setup_state fails after pit_clockevent_per_cpu_init registers an IRQ. A local user can trigger the affected error path and cause the IRQ to fire to cause a use-after-free.
Affected software
Linux kernel
How to mitigate CVE-2026-89769
Install security update from vendor's repository.