SB20260424227 - Use-after-free in Linux kernel display amdgpu_dm driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-31488)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in the amdgpu display manager stream handling logic when processing KMS commits involving DSC validation and unrelated mode changes. A local user can trigger a crafted display configuration change to cause a denial of service.

The issue can occur when MST/DSC configuration changes happen in the same commit as a separate mode change, leading to incorrect stream lifetime handling when the stream is later disabled.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/10862e344b4d6434642a48c87d765813fc0b0ba7
• https://git.kernel.org/stable/c/111208b5b7ebcdadb3f922cc52d8425f0fa91b33
• https://git.kernel.org/stable/c/8a5edc97fd9c6415ff2eff872748439a97e3c3d8
• https://git.kernel.org/stable/c/aed3d041ab061ec8a64f50a3edda0f4db7280025