CVE-2026-53135 drm/amd/display: Fix NULL deref and buffer over-read in SDP debugfs
A local attacker can crash the Linux kernel by writing to a debugfs node when a display connector is unbound, causing a null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53135?
CVE-2026-53135 is a medium-severity vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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)
Weakness: CWE-476
Which versions are affected by CVE-2026-53135?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53135?
Apply the vendor's patch.
Is CVE-2026-53135 being exploited?
There is no known exploitation of CVE-2026-53135 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90785, BELL-CVE-2026-53135, DEBIAN-CVE-2026-53135, GHSA-mmv6-wm63-ppr6, ROOT-OS-DEBIAN-11-CVE-2026-53135, ROOT-OS-DEBIAN-12-CVE-2026-53135 and 3 more.