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CVE-2026-72482

Estado: RecibidaAlta (7.8)—

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

gpib: fix double decrement of descriptor_busy in command_ioctl()

commit d1857f8296dc ("gpib: fix use-after-free in IO ioctl handlers") introduced a descriptor_busy reference counter to pin struct gpib_descriptor across IO ioctl operations. In command_ioctl(), the error path inside the loop decrements descriptor_busy and breaks, but execution then falls through to the unconditional decrement after the loop, underflowing the counter to -1.

This re-enables the use-after-free that the original fix was meant to prevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on an actively-used descriptor and frees it.

Leer descripción completaMostrar menos

Remove the early decrement from the error path. The post-loop decrement already handles all exit paths, matching the correct pattern used in read_ioctl() and write_ioctl().

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 kernel Linux que causa use-after-free por doble decremento en gestor de referencias; un usuario local puede explotar para escalada de privilegios o acceso a memoria de kernel.

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 ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

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-2026-72482",
  "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": "cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c",
              "lessThan": "fdee9f207a48ce204ec6cfceaa1459d2473600a5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6",
              "lessThan": "8b5f1d295dda8677e4545ce340053fcfa8b634c7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6",
              "lessThan": "c4faab452b3c1ada003d49c477609dd80523b9bf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "28c75dd143ead62e0dfac564c79d251e21d5d74b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.18.22",
              "lessThan": "6.18.40",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.19.12",
              "lessThan": "6.20",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/gpib/common/gpib_os.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpib/common/gpib_os.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:22.430",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/8b5f1d295dda8677e4545ce340053fcfa8b634c7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c4faab452b3c1ada003d49c477609dd80523b9bf",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fdee9f207a48ce204ec6cfceaa1459d2473600a5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpib: fix double decrement of descriptor_busy in command_ioctl()\n\ncommit d1857f8296dc (\"gpib: fix use-after-free in IO ioctl handlers\")\nintroduced a descriptor_busy reference counter to pin struct\ngpib_descriptor across IO ioctl operations.  In command_ioctl(), the\nerror path inside the loop decrements descriptor_busy and breaks, but\nexecution then falls through to the unconditional decrement after the\nloop, underflowing the counter to -1.\n\nThis re-enables the use-after-free that the original fix was meant to\nprevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on\nan actively-used descriptor and frees it.\n\nRemove the early decrement from the error path.  The post-loop\ndecrement already handles all exit paths, matching the correct pattern\nused in read_ioctl() and write_ioctl()."
    }
  ],
  "lastModified": "2026-08-17T06:19:16.347",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}