{"id":"CVE-2026-46245","summary":"drm/amd/display: Fix dc_link NULL handling in HPD init","details":"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-\u003edc_link &&\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The patch adds this NULL check but hopefully it can be removed\n\n    929                         dc_connector_supports_analog(amdgpu_dm_connector-\u003edc_link-\u003elink_id.id);\n    930\n    931                 dc_link = amdgpu_dm_connector-\u003edc_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--\u003e 940                 if (dc_link-\u003eirq_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-\u003eirq_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","modified":"2026-06-11T03:56:45.173081580Z","published":"2026-06-03T15:49:40.645Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46245.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/226a40c06a183abaeb7529a4f54d6c203bd14407"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a490e4d3c9fed1e690c8de348416eea3a9f054ff"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46245.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46245"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c"},{"fixed":"a490e4d3c9fed1e690c8de348416eea3a9f054ff"},{"fixed":"226a40c06a183abaeb7529a4f54d6c203bd14407"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46245.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"6.19.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46245.json"}}],"schema_version":"1.7.5"}