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CVE-2026-68397

Estado: RecibidaAlta (8.8)—

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

net/iucv: take a reference on the socket found in afiucv_hs_rcv()

afiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock, drops the lock, and then passes the socket to the afiucv_hs_callback_*() handlers without holding a reference. AF_IUCV sockets are not RCU-protected and are freed synchronously by iucv_sock_kill() -> sock_put(), so a concurrent close can free the socket in the window between read_unlock() and the handler, which then dereferences freed memory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()).

Leer descripción completaMostrar menos

Take a reference with sock_hold() while the socket is still on the list and release it with sock_put() once the handler has run.

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.

AV:A (red adyacente) sin privilegios → T1210. Use-after-free en kernel permite DoS y escalada: dereference de memoria liberada en socket AF_IUCV.

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

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationDisable or Remove Feature or ProgramApplication 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 KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-68397",
  "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": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "5739be5c19495d709d902a2912c9102ce78740d5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "bc6c6e546ffff8865daaeb622ef348c2d481e80f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "e3e0679fc950191aff8f27fa78abcfc2462cff4a",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "4dc0e63abf8bc7ba8892e617c1fb8b204361e022",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "1801cb20a5025a787d6853e19c38db138344b4b4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "c75a950e77356e526672cba4584080c6c8b793b6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "5595ea59cdf29182cf6a270cacc1426c57b603de",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "4fa349156043dc119721d067329714179f501749",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/iucv/af_iucv.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/iucv/af_iucv.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:33.127",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1801cb20a5025a787d6853e19c38db138344b4b4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4dc0e63abf8bc7ba8892e617c1fb8b204361e022",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4fa349156043dc119721d067329714179f501749",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5595ea59cdf29182cf6a270cacc1426c57b603de",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5739be5c19495d709d902a2912c9102ce78740d5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bc6c6e546ffff8865daaeb622ef348c2d481e80f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c75a950e77356e526672cba4584080c6c8b793b6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e3e0679fc950191aff8f27fa78abcfc2462cff4a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: take a reference on the socket found in afiucv_hs_rcv()\n\nafiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock,\ndrops the lock, and then passes the socket to the afiucv_hs_callback_*()\nhandlers without holding a reference. AF_IUCV sockets are not\nRCU-protected and are freed synchronously by iucv_sock_kill() ->\nsock_put(), so a concurrent close can free the socket in the window\nbetween read_unlock() and the handler, which then dereferences freed\nmemory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()).\n\nTake a reference with sock_hold() while the socket is still on the list\nand release it with sock_put() once the handler has run."
    }
  ],
  "lastModified": "2026-08-19T17:20:47.693",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}