CVE-2026-80519

Estado: RecibidaCrítica (9.8)—

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

ovpn: finish crypto callback cleanup before peer release

Crypto completion callbacks hold both key-slot and peer references. The peer reference pins the netdev, and dropping the last peer reference can let netdev unregistration and module removal make progress.

Do not release that peer reference before the callback has finished its own cleanup. If ovpn_crypto_key_slot_put runs after ovpn_peer_put, it can schedule an RCU callback backed by module text after ovpn_cleanup rcu_barrier has already run. The TX error path also freed the remaining skb after ovpn_peer_put, leaving callback cleanup outside the peer/netdev lifetime window.

Leer descripción completaMostrar menos

Release the key slot and free any remaining skb first, then drop the peer reference as the last callback action.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.65%
Percentil entre todas las CVEs puntuadas: 49
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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access45 %
Impacto secundarioT1068 Exploitation for Privilege Escalationprivilege escalation40 %

Vulnerabilidad crítica en kernel Linux (AV:N, PR:N) permitiendo acceso remoto sin autenticación. El defecto de liberación de referencias puede causar uso-después-liberación (UAF), facilitando DoS o escalada local a root desde el contexto del 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

Application Isolation and Sandboxing Exploit Protection Update Software Vulnerability Scanning Threat Intelligence Program 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)

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{
  "id": "CVE-2026-80519",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/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": 3.9
      }
    ]
  },
  "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": "8534731dbf2d52a539b94defd06d2a8d3514aacb",
              "lessThan": "a3a676495c6419e0cca04d6a67227604e92a3d5a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8534731dbf2d52a539b94defd06d2a8d3514aacb",
              "lessThan": "4b0de8be288f5fbec5d8ee64ed4e8b14bf19b517",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8534731dbf2d52a539b94defd06d2a8d3514aacb",
              "lessThan": "9e163917a86c6adfbe150e13f4c73653a54616de",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ovpn/io.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.16",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ovpn/io.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-26T15:17:05.420",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4b0de8be288f5fbec5d8ee64ed4e8b14bf19b517",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9e163917a86c6adfbe150e13f4c73653a54616de",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a3a676495c6419e0cca04d6a67227604e92a3d5a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novpn: finish crypto callback cleanup before peer release\n\nCrypto completion callbacks hold both key-slot and peer references. The\npeer reference pins the netdev, and dropping the last peer reference can\nlet netdev unregistration and module removal make progress.\n\nDo not release that peer reference before the callback has finished its\nown cleanup. If ovpn_crypto_key_slot_put runs after ovpn_peer_put, it can\nschedule an RCU callback backed by module text after ovpn_cleanup\nrcu_barrier has already run. The TX error path also freed the remaining\nskb after ovpn_peer_put, leaving callback cleanup outside the peer/netdev\nlifetime window.\n\nRelease the key slot and free any remaining skb first, then drop the peer\nreference as the last callback action."
    }
  ],
  "lastModified": "2026-08-27T06:17:30.167",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}