CVE-2024-46730 (GCVE-0-2024-46730)

Vulnerability from cvelistv5 – Published: 2024-09-18 06:32 – Updated: 2026-08-05 11:38
VLAI
Title
drm/amd/display: Ensure array index tg_inst won't be -1
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Ensure array index tg_inst won't be -1 [WHY & HOW] tg_inst will be a negative if timing_generator_count equals 0, which should be checked before used. This fixes 2 OVERRUN 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 14:54 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < a64284b9e1999ad5580debced4bc6d6adb28aad4 (git)
Affected: 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c , < 687fe329f18ab0ab0496b20ed2cb003d4879d931 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.10.9 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                      "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: Ensure array index tg_inst won\u0027t be -1\n\n[WHY \u0026 HOW]\ntg_inst will be a negative if timing_generator_count equals 0, which\nshould be checked before used.\n\nThis fixes 2 OVERRUN 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 reached only through DRM modeset ioctls on /dev/dri/card* (DRM_IOCTL_MODE_ATOMIC / SETCRTC) via amdgpu_dm_atomic_check() \u2192 dc_state_add_stream() \u2192 resource_map_pool_resources(). No network or remote input reaches this path.\nAC:L - Within an affected resource-pool configuration the negative index is taken deterministically on every stream-add whose pipe_idx exceeds timing_generator_count; there is no race to win and no memory-layout condition the attacker must guess, and the attacker chooses when to issue the modeset.\nPR:L - A local unprivileged user with a DRM fd holding master \u2014 the ordinary case for a logged-in console/graphical session, an Android compositor client, or a kiosk display stack \u2014 can issue the atomic modeset; no capability check exists anywhere on the path from the ioctl to acquire_otg_master_pipe_for_stream().\nUI:N - The attacker performs the modeset/stream-add entirely on their own; no action by another user or administrator is required.\nS:U - The corruption and its consequences stay inside the kernel\u0027s amdgpu display driver under the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The \u22121 index reads pointers outside the intended arrays and installs them as wrongly-typed objects, so subsequent accesses read struct fields (funcs, inst, dc_context contents) at mismatched offsets from adjacent kernel objects, exposing kernel pointers and enabling further disclosure through the type-confused reads.\nI:H - stream_res.opp \u2014 actually a struct dpp * \u2014 is written through (opp-\u003empcc_disconnect_pending[] stores and mpc_tree_params list manipulation corrupt the DPP object), and both stream_res.tg-\u003efuncs and stream_res.opp-\u003efuncs are read from offsets holding non-vtable data, including gamma-LUT bytes supplied by userspace, giving an indirect call through attacker-influenced memory and thus a control-flow hijack primitive.\nA:H - At minimum the wrongly-typed or NULL pointer is dereferenced and called through during pipe programming, producing an immediate kernel oops/panic in the display pipeline, repeatable at will by the local attacker."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:38:10.644Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/a64284b9e1999ad5580debced4bc6d6adb28aad4"
            },
            {
              "url": "https://git.kernel.org/stable/c/687fe329f18ab0ab0496b20ed2cb003d4879d931"
            }
          ],
          "title": "drm/amd/display: Ensure array index tg_inst won\u0027t be -1",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-46730",
        "datePublished": "2024-09-18T06:32:25.524Z",
        "dateReserved": "2024-09-11T15:12:18.256Z",
        "dateUpdated": "2026-08-05T11:38:10.644Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.