CVE-2026-74537

Estado: RecibidaAlta (8.8)—

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

Bluetooth: ISO: hold sk properly in iso_conn_ready

sk deref in iso_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk is currently accessed without either:

Fix possible UAF by holding sk refcount in iso_conn_ready(). Also recheck after lock_sock that the socket is still valid. Adjust locking so conn->sk is cleared only under lock_sock.

Detalles técnicos trazas, registros y código del informe original

    [Task 1]            [Task 2]
                        iso_sock_release
    iso_conn_ready
      sk = conn->sk
                          lock_sock(sk)
                            conn->sk = NULL
      lock_sock(sk)
                          release_sock(sk)
                          iso_sock_kill(sk)
       UAF on sk deref

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.24%
Percentil entre todas las CVEs puntuadas: 14
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement45 %
Impacto principalT1068 Exploitation for Privilege Escalationprivilege escalation70 %

Acceso de red adyacente (AV:A) sin privilegios en núcleo Linux; UAF permite escalada a privilegios elevados (C:H/I:H/A:H). La corrección menciona refcount y lock_sock para evitar acceso concurrente.

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 Program Application Isolation and Sandboxing Exploit Protection Update Software Vulnerability Scanning Privileged Account Management

Tecnologías afectadas (1)

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

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-74537",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "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": "27c24fda62b601d6f9ca5e992502578c4310876f",
              "lessThan": "4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "27c24fda62b601d6f9ca5e992502578c4310876f",
              "lessThan": "1308d72903d792d10b82bc4ef08b8a4452308b04",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "27c24fda62b601d6f9ca5e992502578c4310876f",
              "lessThan": "0d255e63fcf3f13a570d7ac11678fa1164ac015c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T13:17:59.040",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0d255e63fcf3f13a570d7ac11678fa1164ac015c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1308d72903d792d10b82bc4ef08b8a4452308b04",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: hold sk properly in iso_conn_ready\n\nsk deref in iso_conn_ready must be done either under conn->lock, or\nholding a refcount, to avoid concurrent close. conn->sk is currently\naccessed without either:\n\n    [Task 1]            [Task 2]\n                        iso_sock_release\n    iso_conn_ready\n      sk = conn->sk\n                          lock_sock(sk)\n                            conn->sk = NULL\n      lock_sock(sk)\n                          release_sock(sk)\n                          iso_sock_kill(sk)\n       UAF on sk deref\n\nFix possible UAF by holding sk refcount in iso_conn_ready().  Also\nrecheck after lock_sock that the socket is still valid.  Adjust locking\nso conn->sk is cleared only under lock_sock."
    }
  ],
  "lastModified": "2026-08-17T06:19:50.807",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}