SB20260917156 - Use-after-free in Linux kernel drm nouveau driver
Published: September 17, 2026
Security Bulletin ID
SB20260917156
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-89803)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.