CVE-2026-53313

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths<br /> <br /> In dc_dmub_srv_log_diagnostic_data() and<br /> dc_dmub_srv_enable_dpia_trace().<br /> <br /> Both functions check:<br /> <br /> if (!dc_dmub_srv || !dc_dmub_srv-&gt;dmub)<br /> <br /> and then call DC_LOG_ERROR() inside that block.<br /> <br /> DC_LOG_ERROR() uses dc_dmub_srv-&gt;ctx internally. So if<br /> dc_dmub_srv is NULL, the logging itself can dereference a<br /> NULL pointer and cause a crash.<br /> <br /> Fix this by splitting the checks.<br /> <br /> First check if dc_dmub_srv is NULL and return immediately.<br /> Then check dc_dmub_srv-&gt;dmub and log the error only when<br /> dc_dmub_srv is valid.<br /> <br /> Fixes the below:<br /> ../display/dc/dc_dmub_srv.c:962 dc_dmub_srv_log_diagnostic_data() error: we previously assumed &amp;#39;dc_dmub_srv&amp;#39; could be null (see line 961)<br /> ../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_enable_dpia_trace() error: we previously assumed &amp;#39;dc_dmub_srv&amp;#39; could be null (see line 1166)