github - ghsa-phmc-8r45-84x7

GHSA-PHMC-8R45-84X7

Vulnerability from github – Published: 2025-12-09 03:31 – Updated: 2025-12-09 03:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm: bridge: dw_hdmi: fix connector access for scdc

Commit 5d844091f237 ("drm/scdc-helper: Pimp SCDC debugs") changed the scdc interface to pick up an i2c adapter from a connector instead. However, in the case of dw-hdmi, the wrong connector was being used to pass i2c adapter information, since dw-hdmi's embedded connector structure is only populated when the bridge attachment callback explicitly asks for it.

drm-meson is handling connector creation, so this won't happen, leading to a NULL pointer dereference.

Fix it by having scdc functions access dw-hdmi's current connector pointer instead, which is assigned during the bridge enablement stage.

[narmstrong: moved Fixes tag before first S-o-b and added Reported-by tag]

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2023-53784"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-09T01:16:49Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: bridge: dw_hdmi: fix connector access for scdc\n\nCommit 5d844091f237 (\"drm/scdc-helper: Pimp SCDC debugs\") changed the scdc\ninterface to pick up an i2c adapter from a connector instead. However, in\nthe case of dw-hdmi, the wrong connector was being used to pass i2c adapter\ninformation, since dw-hdmi\u0027s embedded connector structure is only populated\nwhen the bridge attachment callback explicitly asks for it.\n\ndrm-meson is handling connector creation, so this won\u0027t happen, leading to\na NULL pointer dereference.\n\nFix it by having scdc functions access dw-hdmi\u0027s current connector pointer\ninstead, which is assigned during the bridge enablement stage.\n\n[narmstrong: moved Fixes tag before first S-o-b and added Reported-by tag]",
  "id": "GHSA-phmc-8r45-84x7",
  "modified": "2025-12-09T03:31:10Z",
  "published": "2025-12-09T03:31:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53784"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/552f79aa9e801ed4f74d6b3221af78042ba4f235"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98703e4e061fb8715c7613cd227e32cdfd136b23"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2023-53784 (GCVE-0-2023-53784)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-09 00:00

Title

drm: bridge: dw_hdmi: fix connector access for scdc

Summary

In the Linux kernel, the following vulnerability has been resolved: drm: bridge: dw_hdmi: fix connector access for scdc Commit 5d844091f237 ("drm/scdc-helper: Pimp SCDC debugs") changed the scdc interface to pick up an i2c adapter from a connector instead. However, in the case of dw-hdmi, the wrong connector was being used to pass i2c adapter information, since dw-hdmi's embedded connector structure is only populated when the bridge attachment callback explicitly asks for it. drm-meson is handling connector creation, so this won't happen, leading to a NULL pointer dereference. Fix it by having scdc functions access dw-hdmi's current connector pointer instead, which is assigned during the bridge enablement stage. [narmstrong: moved Fixes tag before first S-o-b and added Reported-by tag]

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/552f79aa9e801ed4f…
	https://git.kernel.org/stable/c/98703e4e061fb8715…

Impacted products

Vendor

Product

Version

Linux

Affected: 5d844091f2370f01752c3129b147861b9dcd3d98 , < 552f79aa9e801ed4f74d6b3221af78042ba4f235 (git)
Affected: 5d844091f2370f01752c3129b147861b9dcd3d98 , < 98703e4e061fb8715c7613cd227e32cdfd136b23 (git)

Linux

Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.4.5 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/bridge/synopsys/dw-hdmi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "552f79aa9e801ed4f74d6b3221af78042ba4f235",
              "status": "affected",
              "version": "5d844091f2370f01752c3129b147861b9dcd3d98",
              "versionType": "git"
            },
            {
              "lessThan": "98703e4e061fb8715c7613cd227e32cdfd136b23",
              "status": "affected",
              "version": "5d844091f2370f01752c3129b147861b9dcd3d98",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/bridge/synopsys/dw-hdmi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.5",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: bridge: dw_hdmi: fix connector access for scdc\n\nCommit 5d844091f237 (\"drm/scdc-helper: Pimp SCDC debugs\") changed the scdc\ninterface to pick up an i2c adapter from a connector instead. However, in\nthe case of dw-hdmi, the wrong connector was being used to pass i2c adapter\ninformation, since dw-hdmi\u0027s embedded connector structure is only populated\nwhen the bridge attachment callback explicitly asks for it.\n\ndrm-meson is handling connector creation, so this won\u0027t happen, leading to\na NULL pointer dereference.\n\nFix it by having scdc functions access dw-hdmi\u0027s current connector pointer\ninstead, which is assigned during the bridge enablement stage.\n\n[narmstrong: moved Fixes tag before first S-o-b and added Reported-by tag]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T00:00:39.591Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/552f79aa9e801ed4f74d6b3221af78042ba4f235"
        },
        {
          "url": "https://git.kernel.org/stable/c/98703e4e061fb8715c7613cd227e32cdfd136b23"
        }
      ],
      "title": "drm: bridge: dw_hdmi: fix connector access for scdc",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53784",
    "datePublished": "2025-12-09T00:00:39.591Z",
    "dateReserved": "2025-12-08T23:58:35.272Z",
    "dateUpdated": "2025-12-09T00:00:39.591Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-PHMC-8R45-84X7

CVE-2023-53784 (GCVE-0-2023-53784)

Tags

Sightings

Nomenclature