Use-after-free in Linux kernel - CVE-2026-89463
Published: September 12, 2026
Vulnerability identifier: #VU149344
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89463
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to use-after-free in the ucs1002 health_poll delayed work when unbinding the ucs1002 driver while health polling work is queued. A local privileged user can cause the driver to be unbound while health polling work is queued to cause a denial of service.
The delayed work can reschedule itself while the chip reports a bad-health condition.
Affected software
Linux kernel
How to mitigate CVE-2026-89463
Install security update from vendor's repository.