{"id":"CVE-2026-53313","state":"PUBLISHED","title":"drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths\n\nIn dc_dmub_srv_log_diagnostic_data() and\ndc_dmub_srv_enable_dpia_trace().\n\nBoth functions check:\n\n  if (!dc_dmub_srv || !dc_dmub_srv->dmub)\n\nand then call DC_LOG_ERROR() inside that block.\n\nDC_LOG_ERROR() uses dc_dmub_srv->ctx internally. So if\ndc_dmub_srv is NULL, the logging itself can dereference a\nNULL pointer and cause a crash.\n\nFix this by splitting the checks.\n\nFirst check if dc_dmub_srv is NULL and return immediately.\nThen check dc_dmub_srv->dmub and log the error only when\ndc_dmub_srv is valid.\n\nFixes the below:\n../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)\n../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)","publishedAt":"2026-06-26T19:41:06.568Z","updatedAt":"2026-10-30T12:26:57.879Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"2afedb8b9262df2a09e62ee7c22530a8c9df5934","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"1cad9afbb2d559b738b83c498f9c1abdfd327e7f","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"a71fdbd6e8289e2725d33a9873833459f3b1824f","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"4ae3e16f4b3bf64140f773629b765d605ee079a9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c"]}],"references":["https://git.kernel.org/stable/c/2afedb8b9262df2a09e62ee7c22530a8c9df5934","https://git.kernel.org/stable/c/1cad9afbb2d559b738b83c498f9c1abdfd327e7f","https://git.kernel.org/stable/c/a71fdbd6e8289e2725d33a9873833459f3b1824f","https://git.kernel.org/stable/c/2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a","https://git.kernel.org/stable/c/b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22","https://git.kernel.org/stable/c/4ae3e16f4b3bf64140f773629b765d605ee079a9"],"weaknesses":[],"ingestedAt":"2026-10-30T12:44:04.813Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53313.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53313","state":"PUBLISHED","datePublished":"2026-06-26T19:41:06.568Z","dateUpdated":"2026-10-30T12:26:57.879Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.397Z"},"containers":{"cna":{"title":"drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths\n\nIn dc_dmub_srv_log_diagnostic_data() and\ndc_dmub_srv_enable_dpia_trace().\n\nBoth functions check:\n\n  if (!dc_dmub_srv || !dc_dmub_srv->dmub)\n\nand then call DC_LOG_ERROR() inside that block.\n\nDC_LOG_ERROR() uses dc_dmub_srv->ctx internally. So if\ndc_dmub_srv is NULL, the logging itself can dereference a\nNULL pointer and cause a crash.\n\nFix this by splitting the checks.\n\nFirst check if dc_dmub_srv is NULL and return immediately.\nThen check dc_dmub_srv->dmub and log the error only when\ndc_dmub_srv is valid.\n\nFixes the below:\n../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)\n../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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"2afedb8b9262df2a09e62ee7c22530a8c9df5934","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"1cad9afbb2d559b738b83c498f9c1abdfd327e7f","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"a71fdbd6e8289e2725d33a9873833459f3b1824f","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22","versionType":"git"},{"version":"2631ac1ac328189031d1aefbbd4929050f72fb23","status":"affected","lessThan":"4ae3e16f4b3bf64140f773629b765d605ee079a9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2afedb8b9262df2a09e62ee7c22530a8c9df5934"},{"url":"https://git.kernel.org/stable/c/1cad9afbb2d559b738b83c498f9c1abdfd327e7f"},{"url":"https://git.kernel.org/stable/c/a71fdbd6e8289e2725d33a9873833459f3b1824f"},{"url":"https://git.kernel.org/stable/c/2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a"},{"url":"https://git.kernel.org/stable/c/b37a978e6d8c33fbfa4abc5dcca4c7cfc6d01f22"},{"url":"https://git.kernel.org/stable/c/4ae3e16f4b3bf64140f773629b765d605ee079a9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:26:57.879Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}