{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46245","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-13T15:03:33.107Z","datePublished":"2026-06-03T15:49:40.645Z","dateUpdated":"2026-06-03T15:49:40.645Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-03T15:49:40.645Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix dc_link NULL handling in HPD init\n\namdgpu_dm_hpd_init() may see connectors without a valid dc_link.\n\nThe code already checks dc_link for the polling decision, but later\nunconditionally dereferences it when setting up HPD interrupts.\n\nAssign dc_link early and skip connectors where it is NULL.\n\nFixes the below:\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c:940 amdgpu_dm_hpd_init()\nerror: we previously assumed 'dc_link' could be null (see line 931)\n\ndrivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c\n    923                 /*\n    924                  * Analog connectors may be hot-plugged unlike other connector\n    925                  * types that don't support HPD. Only poll analog connectors.\n    926                  */\n    927                 use_polling |=\n    928                         amdgpu_dm_connector->dc_link &&\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The patch adds this NULL check but hopefully it can be removed\n\n    929                         dc_connector_supports_analog(amdgpu_dm_connector->dc_link->link_id.id);\n    930\n    931                 dc_link = amdgpu_dm_connector->dc_link;\n\ndc_link assigned here.\n\n    932\n    933                 /*\n    934                  * Get a base driver irq reference for hpd ints for the lifetime\n    935                  * of dm. Note that only hpd interrupt types are registered with\n    936                  * base driver; hpd_rx types aren't. IOW, amdgpu_irq_get/put on\n    937                  * hpd_rx isn't available. DM currently controls hpd_rx\n    938                  * explicitly with dc_interrupt_set()\n    939                  */\n--> 940                 if (dc_link->irq_source_hpd != DC_IRQ_SOURCE_INVALID) {\n                            ^^^^^^^^^^^^^^^^^^^^^^^ If it's NULL then we are trouble because we dereference it here.\n\n    941                         irq_type = dc_link->irq_source_hpd - DC_IRQ_SOURCE_HPD1;\n    942                         /*\n    943                          * TODO: There's a mismatch between mode_info.num_hpd\n    944                          * and what bios reports as the # of connectors with hpd"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c"],"versions":[{"version":"4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c","lessThan":"a490e4d3c9fed1e690c8de348416eea3a9f054ff","status":"affected","versionType":"git"},{"version":"4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c","lessThan":"226a40c06a183abaeb7529a4f54d6c203bd14407","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c"],"versions":[{"version":"4.15","status":"affected"},{"version":"0","lessThan":"4.15","status":"unaffected","versionType":"semver"},{"version":"6.19.4","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a490e4d3c9fed1e690c8de348416eea3a9f054ff"},{"url":"https://git.kernel.org/stable/c/226a40c06a183abaeb7529a4f54d6c203bd14407"}],"title":"drm/amd/display: Fix dc_link NULL handling in HPD init","x_generator":{"engine":"bippy-1.2.0"}}}}