drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths (CVE-2026-53313) | HOL Guard CVE

Medium · CVSS 5.5CVE-2026-53313

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

Answer in brief

CVE-2026-53313 records a Medium severity (CVSS 5.5) vulnerability in drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 26, 2026Updated Sep 7, 2026Source checked Sep 7, 2026First seen by HOL Jun 26, 2026Material review Sep 7, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=2631ac1ac328189031d1aefbbd4929050f72fb23 <a71fdbd6e8289e2725d33a9873833459f3b1824f \|\| >=2631ac1ac328189031d1aefbbd4929050f72fb23 <2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a \|\| >=2631ac1ac328189031d1aefbbd4929050f72fb23 <b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22 \|\| >=2631ac1ac328189031d1aefbbd4929050f72fb23 <4ae3e16f4b3bf64140f773629b765d605ee079a9	a71fdbd6e8289e2725d33a9873833459f3b1824f, 2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a, b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22, 4ae3e16f4b3bf64140f773629b765d605ee079a9
Linux/Linuxgeneric	5.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to a71fdbd6e8289e2725d33a9873833459f3b1824f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 26, 2026

Sources and claim methodology

Upstream source description

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)

Quoted source text, attributed separately from HOL analysis.