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CVE-2026-68235

Estado: RecibidaSin puntuar—

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

drm/amd/display: dce100: skip non-DP stream encoders for DP MST

On DCE8-class ASICs (e.g. Bonaire), the resource pool contains digital DIG stream encoders plus one analog DAC encoder. When assigning a stream encoder for a second DisplayPort MST stream, if the preferred digital encoder is already acquired, dce100_find_first_free_match_stream_enc_for_link() falls back to the first free pool entry. That entry may be the analog encoder, whose funcs table lacks DP hooks such as dp_set_stream_attribute. The subsequent atomic commit then dereferences NULL function pointers in link_set_dpms_on() and crashes.

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Skip encoders without dp_set_stream_attribute when the stream uses a DP signal (including MST). Use dc_is_dp_signal(stream->signal) for the MST fallback path instead of checking only the link connector signal.

Tested on: - GPU: AMD Radeon R7 260X (Bonaire / DCE8) - Board: Supermicro C9X299-PG300 - Setup: DP MST daisy chain, hotplug second monitor or have it connected on boot - Kernel: 7.1.3 (issue observed since 6.19) - Result: kernel oops without patch; dual monitors stable with patch

(cherry picked from commit 28ec64943e3ee4d9b8d30cea61e380f1429953a8)

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-68235",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5834c33fd3f6f2a26dd4d6d4bbc7b8ed1c2ac4aa",
              "lessThan": "ed2d86aef9fa4c43f82da0fca91a60f7326d7d03",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5834c33fd3f6f2a26dd4d6d4bbc7b8ed1c2ac4aa",
              "lessThan": "d340cba0df4cf327c7e89c7c1a4e79d4771d7dd5",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:11.827",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/d340cba0df4cf327c7e89c7c1a4e79d4771d7dd5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ed2d86aef9fa4c43f82da0fca91a60f7326d7d03",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: dce100: skip non-DP stream encoders for DP MST\n\nOn DCE8-class ASICs (e.g. Bonaire), the resource pool contains digital\nDIG stream encoders plus one analog DAC encoder. When assigning a stream\nencoder for a second DisplayPort MST stream, if the preferred digital\nencoder is already acquired, dce100_find_first_free_match_stream_enc_for_link()\nfalls back to the first free pool entry. That entry may be the analog\nencoder, whose funcs table lacks DP hooks such as dp_set_stream_attribute.\nThe subsequent atomic commit then dereferences NULL function pointers in\nlink_set_dpms_on() and crashes.\n\nSkip encoders without dp_set_stream_attribute when the stream uses a DP\nsignal (including MST). Use dc_is_dp_signal(stream->signal) for the MST\nfallback path instead of checking only the link connector signal.\n\nTested on:\n- GPU: AMD Radeon R7 260X (Bonaire / DCE8)\n- Board: Supermicro C9X299-PG300\n- Setup: DP MST daisy chain, hotplug second monitor or have it connected on boot\n- Kernel: 7.1.3 (issue observed since 6.19)\n- Result: kernel oops without patch; dual monitors stable with patch\n\n(cherry picked from commit 28ec64943e3ee4d9b8d30cea61e380f1429953a8)"
    }
  ],
  "lastModified": "2026-08-18T07:16:50.750",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}