SB2026040662 - Improper access control in Linux kernel drm xe driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-23466)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper access control in GGTT MMIO access protection when tearing down the xe driver after a failed driver load or asynchronous buffer object cleanup. A local user can trigger access to the GGTT MMIO region after teardown begins to cause a denial of service.

The issue occurs because existing protection based on drm_dev_enter is insufficient if driver load fails, and buffer objects with GGTT mappings may be freed asynchronously by worker threads.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/01f2557aa684e514005541e71a3d01f4cd45c170
• https://git.kernel.org/stable/c/1e9e2640d870d4837bcfdc220cb2c99ae5ee119f
• https://git.kernel.org/stable/c/76326dc06d8793c2c81c31cc0115dbc348de2f88
• https://git.kernel.org/stable/c/e2b424aadecb640f9e037b2891191cf8fd4c64cf