CVE-2026-74534

Estado: RecibidaAlta (8.8)—

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

Bluetooth: ISO: fix refcounting of iso_conn

iso_conn_del() and iso_chan_del() have a race that results to double-put of iso_conn:

The extra put for !sk in iso_conn_del() is currently required since failing iso_chan_add() may leave iso_conn not associated with any sk.

Fix by having iso_pi(sk)->conn own refcount when non-NULL, so iso_conn_del does not need to put it. Adjust the iso_conn_add() refcounting so that conn is put if it does not get associated with an sk.

Detalles técnicos trazas, registros y código del informe original

    [Task hdev->workqueue]         [Task 2]
    iso_conn_del                   iso_chan_del
      iso_conn_hold_unless_zero      iso_conn_lock
      iso_conn_lock                  conn->sk = NULL
                                     iso_conn_unlock
      sk = iso_sock_hold(conn)  <---------´
      if (!sk) iso_conn_put          iso_conn_put
      iso_conn_put /* UAF */

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: 0.38%
Percentil entre todas las CVEs puntuadas: 29
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 movement60 %

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability Scanning Threat Intelligence Program Privileged Account Management Network Segmentation Disable or Remove Feature or Program Application Isolation and Sandboxing

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-2026-74534",
  "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": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
              "lessThan": "3b921533e8aa95b77aadcf31737595578e735f3c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
              "lessThan": "8208b4939afb0a1977fffe902c3ca42fe0f3baaa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
              "lessThan": "fdfde532ab1caa165fcd8985001157ac8b4db365",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f53e7489273dc2bb307bf50f319b3762d45534f0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a58d0f5dac322e16cc75334d000666512341bde5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.11.11",
              "lessThan": "6.12",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.2",
              "lessThan": "6.13",
              "versionType": "semver"
            }
          ],
          "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": "6.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.13",
              "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": "2026-08-15T13:17:58.700",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3b921533e8aa95b77aadcf31737595578e735f3c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8208b4939afb0a1977fffe902c3ca42fe0f3baaa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fdfde532ab1caa165fcd8985001157ac8b4db365",
      "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: fix refcounting of iso_conn\n\niso_conn_del() and iso_chan_del() have a race that results to double-put\nof iso_conn:\n\n    [Task hdev->workqueue]         [Task 2]\n    iso_conn_del                   iso_chan_del\n      iso_conn_hold_unless_zero      iso_conn_lock\n      iso_conn_lock                  conn->sk = NULL\n                                     iso_conn_unlock\n      sk = iso_sock_hold(conn)  <---------´\n      if (!sk) iso_conn_put          iso_conn_put\n      iso_conn_put /* UAF */\n\nThe extra put for !sk in iso_conn_del() is currently required since\nfailing iso_chan_add() may leave iso_conn not associated with any sk.\n\nFix by having iso_pi(sk)->conn own refcount when non-NULL, so\niso_conn_del does not need to put it.  Adjust the iso_conn_add()\nrefcounting so that conn is put if it does not get associated with an\nsk."
    }
  ],
  "lastModified": "2026-08-17T06:19:50.400",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}