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CVE-2026-68204

Estado: RecibidaAlta (7.8)—

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

media: vivid: check for vb2_is_busy() when toggling caps

The vivid_update_format_cap/out() functions must only be called if the capture/output queue are not busy. But for the controls that select the CROP/COMPOSE/SCALE capability that is not checked.

Only when streaming starts will they be set to 'grabbed' and it is impossible to change the control, but between REQBUFS and STREAMON you are still allowed to set these controls. Since vivid_update_format_cap/out will change the format, this can cause unexpected results.

Besides adding these checks, also add a WARN_ON in vivid_update_format_cap/out() if the queue is busy.

Leer descripción completaMostrar menos

I'm 90% certain that this is the cause of this syzbot bug:

https://syzkaller.appspot.com/bug?extid=dac8f5eaa46837e97b89

But since we never have reproducers, it is hard to be certain. In any case, these checks are needed regardless.

CVSS

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local en kernel Linux (AV:L, PR:L) que permite modificar capacidades de formato entre REQBUFS y STREAMON sin validación, causando manipulación de datos o crash (DoS). Requiere privilegios locales y control de parámetros.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

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-2026-68204",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "0a820f03727b509b887f3216a574062948761f34",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "bbc96bc75de0fcd9bb6ac48798b206e3b09ec865",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "6a5bc8aea111ccbca71ef2b9c868d5c81f2e89de",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "a9cd0e8fb0b21faaa71199d9d3feb305c18ff576",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "abaec6747304581f8d4a9936352fa10e13325f07",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "492c97cb50feaa60ccd7792d3d6b904ed8ec61bf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "daf2d92669b4a659d805d88d811161c70cd325ee",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "73c3f48230cda01402ae189b05d56f1f7e0d53c9",
              "lessThan": "c2d1a2130c93f6d758af58590b86b2254c7a1dec",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/media/test-drivers/vivid/vivid-ctrls.c",
            "drivers/media/test-drivers/vivid/vivid-vid-cap.c",
            "drivers/media/test-drivers/vivid/vivid-vid-out.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/media/test-drivers/vivid/vivid-ctrls.c",
            "drivers/media/test-drivers/vivid/vivid-vid-cap.c",
            "drivers/media/test-drivers/vivid/vivid-vid-out.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:08.013",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0a820f03727b509b887f3216a574062948761f34",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/492c97cb50feaa60ccd7792d3d6b904ed8ec61bf",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6a5bc8aea111ccbca71ef2b9c868d5c81f2e89de",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a9cd0e8fb0b21faaa71199d9d3feb305c18ff576",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bbc96bc75de0fcd9bb6ac48798b206e3b09ec865",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c2d1a2130c93f6d758af58590b86b2254c7a1dec",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/daf2d92669b4a659d805d88d811161c70cd325ee",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vivid: check for vb2_is_busy() when toggling caps\n\nThe vivid_update_format_cap/out() functions must only be called if the\ncapture/output queue are not busy. But for the controls that select\nthe CROP/COMPOSE/SCALE capability that is not checked.\n\nOnly when streaming starts will they be set to 'grabbed' and it is\nimpossible to change the control, but between REQBUFS and STREAMON you\nare still allowed to set these controls. Since vivid_update_format_cap/out\nwill change the format, this can cause unexpected results.\n\nBesides adding these checks, also add a WARN_ON in\nvivid_update_format_cap/out() if the queue is busy.\n\nI'm 90% certain that this is the cause of this syzbot bug:\n\nhttps://syzkaller.appspot.com/bug?extid=dac8f5eaa46837e97b89\n\nBut since we never have reproducers, it is hard to be certain. In any case,\nthese checks are needed regardless."
    }
  ],
  "lastModified": "2026-08-19T17:20:36.397",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}