« Volver al listado

CVE-2026-89733

Estado: RecibidaAlta (7.8)—

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

usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()

In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().

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 (AV:L/PR:L) en USB gadget del kernel Linux. UAF en punteros dangling permite ejecución de código o denegación de servicio con privilegios de usuario local elevados.

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

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

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)

Mostrar
{
  "id": "CVE-2026-89733",
  "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": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "85dd5e8bd6776d02854f2847d83429f1f712e99c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "502a7f5b79b7ba751988789e982924f8f496129f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "bec7708eb3b5295d12e931db24381b7c94c72953",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "8e88ed8a374de67270d38689f2a81018909cafbb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "9897b7da8c0ad8356c1b8649379fcb5a689462cb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "38f822ddce9355893d734279a26ddec45182197e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f9df939385527049c8062a099fbfa1479fe7ce0",
              "lessThan": "bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1efa8a5aac93d9e67075995d7d4902b57ce184f7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e7a4b0efe62e56a0acc81d16091c6efc2a282be8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "065f5561a20659cf17aae5f72b32b5c2695c8e00",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3.2.36",
              "lessThan": "3.3",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.4.25",
              "lessThan": "3.5",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.7.2",
              "lessThan": "3.8",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/usb/gadget/function/f_uvc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/usb/gadget/function/f_uvc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:20:03.730",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()\n\nIn uvc_function_bind() error path, we use usb_ep_free_request which\nuses uvc->control_req but does not set it to NULL afterwards. Thus,\nuvc->control_req is a dangling pointer causing a UAF. Also we do not set\nthe uvc->control_buf pointer to NULL after freeing it, which is another\ndangling pointer. Fix it by setting uvc->control_req to NULL after we run\nusb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the\nsame for uvc_function_unbind()."
    }
  ],
  "lastModified": "2026-09-14T13:19:22.430",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}