{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46245",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-46245"
  ],
  "published": "2026-06-03T15:49:47Z",
  "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->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": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46245"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a490e4d3c9fed1e690c8de348416eea3a9f054ff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/226a40c06a183abaeb7529a4f54d6c203bd14407"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-03T15:49:47Z"
  }
}