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Linux Kernel CVE-2026-53135

| EUVDEUVD-2026-39340 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-mmv6-wm63-ppr6
Linux Amd Denial Of Service Null Pointer Dereference Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
4.1 MEDIUM

Debugfs writes require root/CAP_SYS_ADMIN on hardened systems (PR:H); NULL deref path needs specific hotplug timing state (AC:H); no C/I impact.

3.1 AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jul 07, 2026 - 17:12 vuln.today
CVSS changed
Jul 07, 2026 - 17:07 NVD
5.5 (MEDIUM)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 nvd
MEDIUM 5.5

DescriptionNVD

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)

AnalysisAI

NULL pointer dereference and buffer over-read in the Linux kernel's AMD display driver (drm/amd/display) can be triggered by a local user writing to the sdp_message debugfs node, causing a kernel panic and denial of service. The dp_sdp_message_debugfs_write() function fails to check whether connector->base.state->crtc is NULL - a valid transient state after GPU hotplug before an atomic commit - and unconditionally passes 36 bytes to copy_from_user() regardless of the caller-provided size, enabling a second over-read path. No public exploit or CISA KEV listing exists; EPSS is 0.18% (7th percentile), consistent with a localized, hardware-dependent DoS.

Technical ContextAI

The vulnerability resides in the Direct Rendering Manager (DRM) AMD display subsystem within the Linux kernel (CWE-476, NULL Pointer Dereference). The affected function dp_sdp_message_debugfs_write() is exposed via the kernel's debugfs virtual filesystem and handles Secondary Data Packet (SDP) messages for DisplayPort connections. Two distinct coding errors are present: first, the function dereferences connector->base.state->crtc without a NULL guard, which is reachable when a display connector has been hotplugged but not yet assigned to a CRTC through an atomic modeset commit - a normal intermediate kernel state. Second, the function ignores the 'size' parameter passed by the caller and always invokes copy_from_user() with a hardcoded 36-byte count, reading beyond the user-provided buffer when size < 36. The CPE data confirms the affected component is cpe:2.3:o:linux:linux_kernel across multiple stable branches. Both defects were introduced from commit c7ba3653e977 and are fixed by cherry-pick of upstream commit 6ab4c36a5228.

RemediationAI

The primary fix is to upgrade to a patched Linux kernel version for the applicable stable branch: 5.10.259 or later, 5.15.210 or later, 6.1.176 or later, 6.6.143 or later, 6.12.94 or later, 6.18.36 or later, 7.0.13 or later, or 7.1 final. Upstream fix commits are available at https://git.kernel.org/stable/c/7ae95c0275c330b5dbae806f8e431720edad776f and related stable-tree commits listed in references. Distribution vendors (RHEL, Ubuntu, SUSE, Debian) should be tracked for kernel update advisories incorporating these upstream commits. As a compensating control where patching is not immediately possible, restricting debugfs mount access (e.g., mounting debugfs with nosuid and access controls, or not mounting it on production systems: umount /sys/kernel/debug) eliminates the attack surface entirely with no functional impact on workloads that do not use debugfs. Alternatively, blocking write access to /sys/kernel/debug/dri/*/sdp_message via filesystem permissions or seccomp policy removes this specific path. Unloading the amdgpu kernel module is an aggressive workaround that disables AMD display functionality entirely.

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Same weakness CWE-476 – NULL Pointer Dereference

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

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CVE-2026-53135 vulnerability details – vuln.today
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