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Linux Kernel EUVDEUVD-2026-39848

| CVE-2026-53313 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-06-26 Linux GHSA-2885-rcqv-3jp6
Denial Of Service Linux Null Pointer Dereference Amd
5.5
CVSS 3.1 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain local low-privilege shell
  2. Delivery
    trigger AMD DMUB display error path
  3. Exploit
    dc_dmub_srv passed as NULL
  4. Execution
    DC_LOG_ERROR dereferences NULL ctx pointer
  5. Persist
    kernel panic
  6. Impact
    system denial of service

Vulnerability Assessment

Weakness
CWE
CWE-476
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Null pointer safety, defensive checks
MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

The system must be running Linux kernel versions from 5.14 through pre-patch 7.0.x with an AMD GPU present and the amdgpu kernel module loaded. The vulnerable code paths are within AMD DMUB (Display MicroController Unit Bridge) error-handling routines; the NULL condition arises when dc_dmub_srv is uninitialized or has been torn down. Per the CVSS vector (PR:L), a low-privileged local account is sufficient - no administrative rights are required. The flaw is limited to AMD GPU-equipped machines; systems without AMD display hardware or with the amdgpu driver disabled are completely unaffected. Remote exploitation is not possible given AV:L.
Impact

The CVSS 3.1 score of 5.5 (Medium) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H accurately characterizes this as a local, low-complexity denial-of-service issue requiring only low privileges. The impact is strictly confined to availability - there is no confidentiality or integrity exposure. EPSS at 0.14% (4th percentile) corroborates the low real-world exploitation probability; the local-only attack vector is a meaningful barrier compared to network-reachable vulnerabilities. This CVE is not listed in CISA KEV, and no POC has been identified. In aggregate, this is a low-priority operational issue: it matters for systems with AMD GPU hardware where kernel stability is critical (e.g., production workstations, rendering nodes), but it poses negligible risk of targeted or opportunistic remote exploitation. The primary risk scenario is an accidental or locally-triggered crash rather than deliberate exploitation.
Exploit ScenarioDerived

A local user with standard (low-privilege) account access on a Linux system running an AMD GPU triggers a code path that reaches dc_dmub_srv_log_diagnostic_data() or dc_dmub_srv_enable_dpia_trace() with a NULL dc_dmub_srv pointer, causing DC_LOG_ERROR() to dereference NULL through ctx, generating a kernel NULL pointer dereference oops and crashing the system. No public exploit code has been identified; triggering this path likely requires specific AMD display driver error conditions, reducing opportunistic exploitability.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 06, 2026

NULL pointer dereference in the Linux kernel AMD display driver (drm/amd/display) can cause a kernel panic on systems running AMD GPUs, resulting in a complete denial of service. The flaw resides in dc_dmub_srv_log_diagnostic_data() and dc_dmub_srv_enable_dpia_trace() in dc_dmub_srv.c, where a combined NULL guard incorrectly permits DC_LOG_ERROR() - which internally dereferences dc_dmub_srv->ctx - to execute when dc_dmub_srv itself is NULL. No public exploit has been identified at time of analysis and EPSS sits at the 4th percentile, indicating very low exploitation probability in the wild.

RemediationAI

The upstream fix is available via two stable kernel commits: b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22 (https://git.kernel.org/stable/c/b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22) and 4ae3e16f4b3bf64140f773629b765d605ee079a9 (https://git.kernel.org/stable/c/4ae3e16f4b3bf64140f773629b765d605ee079a9). Upstream fix available via kernel stable tree commits; released patched versions are Linux 7.0.10 and Linux 7.1 per EUVD data - distribution-packaged kernel versions should be verified against vendor advisories. For systems that cannot be patched immediately, a targeted workaround is to prevent loading of the amdgpu driver (e.g., adding 'amdgpu' to /etc/modprobe.d/blacklist.conf) at the cost of losing AMD GPU functionality entirely. Systems not equipped with AMD GPU hardware require no action.

Affected VersionsENISA

Linux patch: 7.0.10
Linux 2631ac1ac328189031d1aefbbd4929050f72fb23 <b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22
Linux patch: 7.1
Linux patch: 0
Linux 2631ac1ac328189031d1aefbbd4929050f72fb23 <4ae3e16f4b3bf64140f773629b765d605ee079a9
Linux 5.14

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

The vulnerability resides in the Display MicroController Unit Bridge Service (dc_dmub_srv) component of the AMD display engine subsystem within the Linux kernel's DRM layer. The root cause class is CWE-476 (NULL Pointer Dereference): both dc_dmub_srv_log_diagnostic_data() (dc_dmub_srv.c:961-962) and dc_dmub_srv_enable_dpia_trace() (dc_dmub_srv.c:1166-1167) perform a combined short-circuit check - if (!dc_dmub_srv || !dc_dmub_srv->dmub) - and then invoke DC_LOG_ERROR() within the same conditional block. Because DC_LOG_ERROR() internally accesses dc_dmub_srv->ctx, if dc_dmub_srv is NULL the macro itself triggers a NULL dereference, crashing the kernel. The fix splits the checks so that a NULL dc_dmub_srv causes an immediate early return before any logging occurs. Affected CPEs: cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:* covering kernel versions from 5.14 through the stable 7.0.x series prior to 7.0.10.

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  • Exploit and PoC references, threat intelligence from 22 sources
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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 5.5 MEDIUM

Local-only vector with low-privilege trigger; pure availability impact (kernel crash); no confidentiality or integrity consequence.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE MEDIUM
Red Hat 5.5 LOW

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

4
CVSS changed
Jul 06, 2026 - 20:22 NVD
5.5 (MEDIUM)
Patch available
Jun 26, 2026 - 21:02 EUVD
CVE Published
Jun 26, 2026 - 19:41 nvd
MEDIUM 5.5
CVE Published
Jun 26, 2026 - 19:41 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

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

drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths

In dc_dmub_srv_log_diagnostic_data() and dc_dmub_srv_enable_dpia_trace().

Both functions check:

if (!dc_dmub_srv || !dc_dmub_srv->dmub)

and then call DC_LOG_ERROR() inside that block.

DC_LOG_ERROR() uses dc_dmub_srv->ctx internally. So if dc_dmub_srv is NULL, the logging itself can dereference a NULL pointer and cause a crash.

Fix this by splitting the checks.

First check if dc_dmub_srv is NULL and return immediately. Then check dc_dmub_srv->dmub and log the error only when dc_dmub_srv is valid.

Fixes the below: ../display/dc/dc_dmub_srv.c:962 dc_dmub_srv_log_diagnostic_data() error: we previously assumed 'dc_dmub_srv' could be null (see line 961) ../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_enable_dpia_trace() error: we previously assumed 'dc_dmub_srv' could be null (see line 1166)

Threat Intelligence Overview

EPSS Score
0.1%
Top 96% exploitable
Prevalence
High
Linux kernel runs vast majority of servers, workstations, and embedded systems
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS MSRC Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
High

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Null Pointer Dereference MEDIUM

A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Same weakness CWE-476 – NULL Pointer Dereference

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CVE-2015-3194 HIGH
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Same technique Denial Of Service

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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

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-53313 ADVISORY https://ubuntu.com/security/notices/USN-8566-1 ADVISORY https://ubuntu.com/security/notices/USN-8568-1 ADVISORY https://vuldb.com/vuln/374391 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3130/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3166/ REF https://git.kernel.org/stable/c/1cad9afbb2d559b738b83c498f9c1abdfd327e7f REF https://git.kernel.org/stable/c/2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a REF https://git.kernel.org/stable/c/2afedb8b9262df2a09e62ee7c22530a8c9df5934 REF https://git.kernel.org/stable/c/4ae3e16f4b3bf64140f773629b765d605ee079a9 REF https://git.kernel.org/stable/c/a71fdbd6e8289e2725d33a9873833459f3b1824f REF https://git.kernel.org/stable/c/b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22

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