CVE-2024-46813 (GCVE-0-2024-46813)

Vulnerability from cvelistv5 – Published: 2024-09-27 12:35 – Updated: 2026-10-30 12:19
VLAI
Title
drm/amd/display: Check link_index before accessing dc->links[]
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Check link_index before accessing dc->links[] [WHY & HOW] dc->links[] has max size of MAX_LINKS and NULL is return when trying to access with out-of-bound index. This fixes 3 OVERRUN and 1 RESOURCE_LEAK issues reported by Coverity.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-29 14:18 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 8ad4c2cf6c1af18f556e5c591fb313b2982ddf60 (git)
Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 032c5407a608ac3b2a98bf4fbda27d12c20c5887 (git)
Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < ac04759b4a002969cf0f1384f1b8bb2001cfa782 (git)
Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 8aa2864044b9d13e95fe224f32e808afbf79ecdf (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.87 , ≤ 6.6.* (semver)
Unaffected: 6.10.9 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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                "drivers/gpu/drm/amd/display/dc/core/dc_link_exports.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.15"
                },
                {
                  "lessThan": "4.15",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.191",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.87",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.10.*",
                  "status": "unaffected",
                  "version": "6.10.9",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.11",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.191",
                      "versionStartIncluding": "4.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.87",
                      "versionStartIncluding": "4.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10.9",
                      "versionStartIncluding": "4.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.11",
                      "versionStartIncluding": "4.15",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Check link_index before accessing dc-\u003elinks[]\n\n[WHY \u0026 HOW]\ndc-\u003elinks[] has max size of MAX_LINKS and NULL is return when trying to\naccess with out-of-bound index.\n\nThis fixes 3 OVERRUN and 1 RESOURCE_LEAK issues reported by Coverity."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable code is in the amdgpu DC display driver, reached during local driver probe and subsequently exercised through the local DRM device node (/dev/dri/card*) via atomic ioctl HDCP operations. There is no network-facing path to dc_get_link_at_index().\nAC:L - On an affected platform (DCN3.1-class hardware with 4 USB4 DPIA links plus a VBIOS reporting enough connector indices to push link_count past MAX_LINKS) the out-of-bounds access occurs deterministically on every driver load, and the subsequent use of the corrupted ddc.handle is reached reliably by enabling HDCP. No unpredictable memory-layout or timing condition must be won.\nPR:L - The out-of-bounds read and type-confused write occur during unprivileged driver initialization, and the corrupted HDCP DDC handle is subsequently dereferenced through the Content Protection connector property, which a local user with access to /dev/dri can set via the DRM atomic ioctl. No root or CAP_SYS_ADMIN is required.\nUI:N - The out-of-bounds indexing happens automatically at driver probe with no victim action, and the follow-on HDCP DDC path is driven entirely by the attacker\u0027s own DRM ioctls.\nS:U - The out-of-bounds access and the resulting corruption are confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The out-of-bounds read pulls adjacent struct dc members (link_srv, current_state, res_pool, clk_mgr) and treats them as a struct dc_link, so subsequent field reads and the HDCP DDC read_dpcd/read_i2c calls interpret arbitrary kernel memory as link state, and the resulting memory corruption can be leveraged for further information disclosure.\nI:H - The type-confused pointer is written through (link-\u003epriv = aconnector, link-\u003epsr_settings.* = ...), corrupting a live kernel object such as struct link_service or dc_state that contains function pointers, giving a memory-corruption primitive exploitable for control-flow hijacking.\nA:H - Dereferencing an out-of-bounds pointer read as a struct dc_link, and corrupting adjacent live kernel structures, reliably produces a kernel oops/panic and leaves the display subsystem in an inconsistent state."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-30T12:19:22.335Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/8ad4c2cf6c1af18f556e5c591fb313b2982ddf60"
            },
            {
              "url": "https://git.kernel.org/stable/c/032c5407a608ac3b2a98bf4fbda27d12c20c5887"
            },
            {
              "url": "https://git.kernel.org/stable/c/ac04759b4a002969cf0f1384f1b8bb2001cfa782"
            },
            {
              "url": "https://git.kernel.org/stable/c/8aa2864044b9d13e95fe224f32e808afbf79ecdf"
            }
          ],
          "title": "drm/amd/display: Check link_index before accessing dc-\u003elinks[]",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-46813",
        "datePublished": "2024-09-27T12:35:55.786Z",
        "dateReserved": "2024-09-11T15:12:18.283Z",
        "dateUpdated": "2026-10-30T12:19:22.335Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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