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CVE-2026-53313

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

Description (CNA)

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)

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 2631ac1ac328189031d1aefbbd4929050f72fb23 before 1cad9afbb2d559b738b83c498f9c1abdfd327e7f; affected 2631ac1ac328189031d1aefbbd4929050f72fb23 before a71fdbd6e8289e2725d33a9873833459f3b1824f; affected 2631ac1ac328189031d1aefbbd4929050f72fb23 before 2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a; affected 2631ac1ac328189031d1aefbbd4929050f72fb23 before b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22; affected 2631ac1ac328189031d1aefbbd4929050f72fb23 before 4ae3e16f4b3bf64140f773629b765d605ee079a9
Linux / Linuxaffected 5.14; unaffected 0 before 5.14; unaffected 6.6.160 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through *

CWE

No CWE identifiers supplied.

References