PT-2026-52231 · Linux · Linux

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-53135

NVD

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)

Related Identifiers

CVE-2026-53135

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-53135 · Security Note
• https://git.kernel.org/stable/c/7fc4fab4acc307ad2903312c195872b2953d32c3 · Note
• https://git.kernel.org/stable/c/c90954cdea4d6998ec345de0d840d030c145b89e · Note
• https://git.kernel.org/stable/c/7ae95c0275c330b5dbae806f8e431720edad776f · Note
• https://git.kernel.org/stable/c/ee9cfcf77a8e8af637396dc00966df5f701e661c · Note
• https://git.kernel.org/stable/c/b781f90a9528555c709e59789550893581ef0be4 · Note
• https://git.kernel.org/stable/c/adf67034b1f61f7119295208085bfd43f85f56af · Note
• https://git.kernel.org/stable/c/a2de1d71891a038a9346b2c1a72b88c8350f2479 · Note
• https://git.kernel.org/stable/c/bb6f705b73b5f191f14ad004e2c8c4b615806187 · Note