{"api_version":"1","generated_at":"2026-10-21T06:20:20+00:00","cve":"CVE-2026-98786","urls":{"html":"https://cve.report/CVE-2026-98786","api":"https://cve.report/api/cve/CVE-2026-98786.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98786","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98786"},"summary":{"title":"drm/amd/display: guard dc_sink dereferences in MST mode validation","description":"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)","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:32","updated_at":"2026-10-19 10:19:42"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/217f64f348c90cba62164e7ff38e0ccf78a5ca09","name":"https://git.kernel.org/stable/c/217f64f348c90cba62164e7ff38e0ccf78a5ca09","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/daa0437fe5e451856aaf8fda602a9fc2105bbd54","name":"https://git.kernel.org/stable/c/daa0437fe5e451856aaf8fda602a9fc2105bbd54","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98786","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98786","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f04d275d94e164d24516c32437c988a323018f63 daa0437fe5e451856aaf8fda602a9fc2105bbd54 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f04d275d94e164d24516c32437c988a323018f63 217f64f348c90cba62164e7ff38e0ccf78a5ca09 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.10 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"daa0437fe5e451856aaf8fda602a9fc2105bbd54","status":"affected","version":"f04d275d94e164d24516c32437c988a323018f63","versionType":"git"},{"lessThan":"217f64f348c90cba62164e7ff38e0ccf78a5ca09","status":"affected","version":"f04d275d94e164d24516c32437c988a323018f63","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.0"},{"lessThan":"6.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.10","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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)"}],"providerMetadata":{"dateUpdated":"2026-10-19T09:25:39.296Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/daa0437fe5e451856aaf8fda602a9fc2105bbd54"},{"url":"https://git.kernel.org/stable/c/217f64f348c90cba62164e7ff38e0ccf78a5ca09"}],"title":"drm/amd/display: guard dc_sink dereferences in MST mode validation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98786","datePublished":"2026-10-18T15:48:22.989Z","dateReserved":"2026-09-25T10:25:14.370Z","dateUpdated":"2026-10-19T09:25:39.296Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:32","lastModifiedDate":"2026-10-19 10:19:42","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98786","Ordinal":"1","Title":"drm/amd/display: guard dc_sink dereferences in MST mode validati","CVE":"CVE-2026-98786","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98786","Ordinal":"1","NoteData":"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)","Type":"Description","Title":"drm/amd/display: guard dc_sink dereferences in MST mode validati"}]}}}