Linux Kernel: AMD DRM Null Deref in dc_dmub_srv Logging
CVE-2026-53313 Published on June 26, 2026
drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths
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)
Products Associated with CVE-2026-53313
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Affected Versions
Linux:- Version 2631ac1ac328189031d1aefbbd4929050f72fb23 and below b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22 is affected.
- Version 2631ac1ac328189031d1aefbbd4929050f72fb23 and below 4ae3e16f4b3bf64140f773629b765d605ee079a9 is affected.
- Version 5.14 is affected.
- Before 5.14 is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.