Linux Kernel: NULL Pointer Deref in AMD DCE Display Driver (drm/amd/display)
CVE-2026-74732 Published on August 22, 2026
drm/amd/display: Check for tg ops in dce110_set_avmute
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Check for tg ops in dce110_set_avmute
Some older DCE timing generators do not implement is_tg_enabled in
their ops table. Calling it unconditionally when waiting for AV mute
frames causes a NULL pointer dereference on Southern Islands dGPUs
when turning the display off over HDMI.
Check that tg and the required ops exist before waiting for frames.
(cherry picked from commit 2686a0c0aaa07bec2e24131835cf27b5fd4935a5)
Products Associated with CVE-2026-74732
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 853c2d31408bd45dcf92d0eb1f06eb439a56cf04 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below d089f32d34f821c8f0ef23d5fcd77bd43c1b3b92 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 5edbb409b0bc5001195f4b7cfca19122361211a1 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 3141e3d61469bba2624a91c5e2407f110b33b29e is affected.
- Before 6.12.104 is affected.
- Before 6.18.45 is affected.
- Before 7.1.9 is affected.
- Version 6.12.104, <= 6.12.* is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.