Use-after-free in Linux kernel - CVE-2026-89803
Published: September 17, 2026
Vulnerability identifier: #VU150478
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89803
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to a use-after-free in the Nouveau channel teardown handler when a channel-kill event is delivered during channel destruction. A local user can trigger a channel-kill event during the teardown window to execute arbitrary code.
The issue affects Fermi and newer GPUs; the kill event must occur while the channel is being destroyed.
Affected software
Linux kernel
How to mitigate CVE-2026-89803
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3