FKIE_CVE-2026-43191

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-11-11 20:10
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Adjust PHY FSM transition to TX_EN-to-PLL_ON for TMDS on DCN35 [Why] A backport of the change made for DCN401 that addresses an issue where we turn off the PHY PLL when disabling TMDS output, which causes the OTG to remain stuck. The OTG being stuck can lead to a hang in the DCHVM's ability to ACK invalidations when it thinks the HUBP is still on but it's not receiving global sync. The transition to PLL_ON needs to be atomic as there's no guarantee that the thread isn't pre-empted or is able to complete before the IOMMU watchdog times out. [How] Backport the implementation from dcn401 back to dcn35. There's a functional difference in when the eDP output is disabled in dcn401 code so we don't want to utilize it directly.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/02b033e18e08a1d0b53cf540196688c82af60a2f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/75372d75a4e23783583998ed99d5009d555850daPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be43c36ac13d3a158791566c9fe60511022b7a15
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51Patch
Impacted products
Vendor Product Version
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c",
            "drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.h",
            "drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_init.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "be43c36ac13d3a158791566c9fe60511022b7a15",
              "status": "affected",
              "version": "ec129fa356bea5411cb16833cc5dab32689ea389",
              "versionType": "git"
            },
            {
              "lessThan": "02b033e18e08a1d0b53cf540196688c82af60a2f",
              "status": "affected",
              "version": "ec129fa356bea5411cb16833cc5dab32689ea389",
              "versionType": "git"
            },
            {
              "lessThan": "d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51",
              "status": "affected",
              "version": "ec129fa356bea5411cb16833cc5dab32689ea389",
              "versionType": "git"
            },
            {
              "lessThan": "75372d75a4e23783583998ed99d5009d555850da",
              "status": "affected",
              "version": "ec129fa356bea5411cb16833cc5dab32689ea389",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c",
            "drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.h",
            "drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_init.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DF4885A9-B170-4EBE-9912-BA83564FBE78",
              "versionEndExcluding": "6.19.6",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Adjust PHY FSM transition to TX_EN-to-PLL_ON for TMDS on DCN35\n\n[Why]\nA backport of the change made for DCN401 that addresses an issue where\nwe turn off the PHY PLL when disabling TMDS output, which causes the\nOTG to remain stuck.\n\nThe OTG being stuck can lead to a hang in the DCHVM\u0027s ability to ACK\ninvalidations when it thinks the HUBP is still on but it\u0027s not receiving\nglobal sync.\n\nThe transition to PLL_ON needs to be atomic as there\u0027s no guarantee\nthat the thread isn\u0027t pre-empted or is able to complete before the\nIOMMU watchdog times out.\n\n[How]\nBackport the implementation from dcn401 back to dcn35.\n\nThere\u0027s a functional difference in when the eDP output is disabled in\ndcn401 code so we don\u0027t want to utilize it directly."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amd/display: Ajustar la transici\u00f3n FSM de PHY a TX_EN-a-PLL_ON para TMDS en DCN35\n\n[Por qu\u00e9]\nUn backport del cambio realizado para DCN401 que aborda un problema donde apagamos el PLL de PHY al deshabilitar la salida TMDS, lo que provoca que el OTG se quede atascado.\n\nEl OTG atascado puede provocar un cuelgue en la capacidad del DCHVM para ACK invalidaciones cuando cree que el HUBP todav\u00eda est\u00e1 encendido pero no est\u00e1 recibiendo sincronizaci\u00f3n global.\n\nLa transici\u00f3n a PLL_ON debe ser at\u00f3mica ya que no hay garant\u00eda de que el hilo no sea expropiado o sea capaz de completarse antes de que el watchdog de IOMMU agote el tiempo.\n\n[C\u00f3mo]\nRealizar un backport de la implementaci\u00f3n de dcn401 a dcn35.\n\nHay una diferencia funcional en cu\u00e1ndo se deshabilita la salida eDP en el c\u00f3digo de dcn401, por lo que no queremos utilizarlo directamente."
    }
  ],
  "id": "CVE-2026-43191",
  "lastModified": "2026-11-11T20:10:00.273",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-43191",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-11-06T15:30:34.879497Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-06T12:16:37.970",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/02b033e18e08a1d0b53cf540196688c82af60a2f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/75372d75a4e23783583998ed99d5009d555850da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/be43c36ac13d3a158791566c9fe60511022b7a15"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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