CVE-2026-23466

drm/xe: Open-code GGTT MMIO access protection

State: Published
Severity: 7.8 High
Published: Apr 3, 2026
Updated: Oct 19, 2026
Reserved: Jan 13, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

drm/xe: Open-code GGTT MMIO access protection

GGTT MMIO access is currently protected by hotplug (drm_dev_enter), which works correctly when the driver loads successfully and is later unbound or unloaded. However, if driver load fails, this protection is insufficient because drm_dev_unplug() is never called.

Additionally, devm release functions cannot guarantee that all BOs with GGTT mappings are destroyed before the GGTT MMIO region is removed, as some BOs may be freed asynchronously by worker threads.

To address this, introduce an open-coded flag, protected by the GGTT lock, that guards GGTT MMIO access. The flag is cleared during the dev_fini_ggtt devm release function to ensure MMIO access is disabled once teardown begins.

(cherry picked from commit 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
LinuxLinux	919bb54e989c1edef87e9797be125c94c450fc65 to before e2b424aadecb640f9e037b2891191cf8fd4c64cfAffected 919bb54e989c1edef87e9797be125c94c450fc65 to before 1e9e2640d870d4837bcfdc220cb2c99ae5ee119fAffected 919bb54e989c1edef87e9797be125c94c450fc65 to before 76326dc06d8793c2c81c31cc0115dbc348de2f88Affected 919bb54e989c1edef87e9797be125c94c450fc65 to before 01f2557aa684e514005541e71a3d01f4cd45c170Affected
LinuxLinux	6.12Affected before 6.12Not affected 6.12.78 through 6.12.Not affected 6.18.20 through 6.18.Not affected 6.19.10 through 6.19.*Not affected 7.0 and laterNot affected

References

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