Linux kernel DRM GGTT MMIO access protection flaw
CVE-2026-23466 Published on April 3, 2026
drm/xe: Open-code GGTT MMIO access protection
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)
Products Associated with CVE-2026-23466
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Affected Versions
Linux:- Version 919bb54e989c1edef87e9797be125c94c450fc65 and below e2b424aadecb640f9e037b2891191cf8fd4c64cf is affected.
- Version 919bb54e989c1edef87e9797be125c94c450fc65 and below 1e9e2640d870d4837bcfdc220cb2c99ae5ee119f is affected.
- Version 919bb54e989c1edef87e9797be125c94c450fc65 and below 76326dc06d8793c2c81c31cc0115dbc348de2f88 is affected.
- Version 919bb54e989c1edef87e9797be125c94c450fc65 and below 01f2557aa684e514005541e71a3d01f4cd45c170 is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.20, <= 6.18.* is unaffected.
- Version 6.19.10, <= 6.19.* is unaffected.
- Version 7.0-rc5, <= * is unaffected.