{"schema":"threatline.record/2","record":{"id":"CVE-2026-98786","aliases":[],"summary":"drm/amd/display: guard dc_sink dereferences in MST mode validation","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: guard dc_sink dereferences in MST mode validation\n\ndm_dp_mst_is_port_support_mode() reads\naconnector->dc_sink->dsc_caps... for the DSC branch-throughput check,\nand get_conv_frl_bw()'s HDMI-PCON FRL-bandwidth path reads\naconnector->dc_sink->edid_caps.max_frl_rate, both without a NULL\ncheck. dc_sink is cleared asynchronously on MST unplug, and both\nfunctions run from paths that the driver's own comments document as\nracing that teardown: the connector probe worker's ->mode_valid\ncallback and a compositor's atomic check, neither of which holds the\nMST manager lock that the teardown path uses. The former does have an\nexisting dsc_aux NULL check, but dsc_aux isn't reliably cleared in\nevery path that clears dc_sink, so it doesn't cover this.\n\nFail the port-support check and skip the FRL conversion path when the\nsink is already gone.\n\n(cherry picked from commit 7c3db8da4e039698ae198c870712428644e965c7)","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98786","source_modified_at":"2026-10-19T09:25:39.296Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"f04d275d94e164d24516c32437c988a323018f63","lessThan":"daa0437fe5e451856aaf8fda602a9fc2105bbd54","status":"affected","versionType":"git"},{"version":"f04d275d94e164d24516c32437c988a323018f63","lessThan":"217f64f348c90cba62164e7ff38e0ccf78a5ca09","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98786","source_modified_at":"2026-10-19T09:25:39.296Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.0","status":"affected"},{"version":"0","lessThan":"6.0","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98786","source_modified_at":"2026-10-19T09:25:39.296Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"217f64f348c90cba62164e7ff38e0ccf78a5ca09","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00155,"percentile":0.04324,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:48:22.989Z","modified_at":"2026-10-19T09:25:39.296Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98786","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:25:39.296Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98786","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/daa0437fe5e451856aaf8fda602a9fc2105bbd54"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/217f64f348c90cba62164e7ff38e0ccf78a5ca09"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:25:39.296Z","content_hash":"ed3ff090710db545db7c27b24b2bfd8584db68d3112c631c1c4f03e4f2743256"}}