CVE-2026-53135

Summary

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

drm/amd/display: Fix NULL deref and buffer over-read in SDP debugfs

[Why & How] dp_sdp_message_debugfs_write() dereferences connector->base.state->crtc without checking for NULL. A connector can be connected but not bound to any CRTC (e.g. after hot-plug before the next atomic commit), causing a kernel crash when writing to the sdp_message debugfs node.

The function also ignores the user-provided size argument and always passes 36 bytes to copy_from_user(), reading past the user buffer when size < 36.

Fix both issues by:

• Returning -ENODEV when connector->base.state or state->crtc is NULL
• Clamping write_size to min(size, sizeof(data))

(cherry picked from commit 6ab4c36a522842ff70474a1c0af2e40e50fc8300)

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/ee9cfcf77a8e8af637396dc00966df5f701e661c
• https://git.kernel.org/stable/c/b781f90a9528555c709e59789550893581ef0be4
• https://git.kernel.org/stable/c/a2de1d71891a038a9346b2c1a72b88c8350f2479
• https://git.kernel.org/stable/c/7fc4fab4acc307ad2903312c195872b2953d32c3
• https://git.kernel.org/stable/c/7ae95c0275c330b5dbae806f8e431720edad776f
• https://git.kernel.org/stable/c/bb6f705b73b5f191f14ad004e2c8c4b615806187
• https://git.kernel.org/stable/c/c90954cdea4d6998ec345de0d840d030c145b89e
• https://git.kernel.org/stable/c/adf67034b1f61f7119295208085bfd43f85f56af

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