CVE-2023-54269

Estado: AplazadaCrítica (9.8)—

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

SUNRPC: double free xprt_ctxt while still in use

When an RPC request is deferred, the rq_xprt_ctxt pointer is moved out of the svc_rqst into the svc_deferred_req. When the deferred request is revisited, the pointer is copied into the new svc_rqst - and also remains in the svc_deferred_req.

In the (rare?) case that the request is deferred a second time, the old svc_deferred_req is reused - it still has all the correct content.

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However in that case the rq_xprt_ctxt pointer is NOT cleared so that when xpo_release_xprt is called, the ctxt is freed (UDP) or possible added to a free list (RDMA). When the deferred request is revisited for a second time, it will reference this ctxt which may be invalid, and the free the object a second time which is likely to oops.

So change svc_defer() to *always* clear rq_xprt_ctxt, and assert that the value is now stored in the svc_deferred_req.

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: 0.55%
Percentil entre todas las CVEs puntuadas: 44
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 access75 %
Impacto principalT1499.004 Application or System Exploitationimpact70 %
Impacto secundarioT1068 Exploitation for Privilege Escalationprivilege escalation65 %

Vuln. remota sin autenticación (CVSS AV:N/PR:N/UI:N) en SUNRPC kernel explotable contra servicios RPC expuestos. DoS por double-free/oops y potencial escalada local post-explotación.

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

Filter Network Traffic Application Isolation and Sandboxing Exploit Protection Update Software Vulnerability Scanning Threat Intelligence Program

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-2023-54269",
  "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": "f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d",
              "lessThan": "7851771789e87108a92697194105ef0c9307dc5e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4",
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              "versionType": "git"
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            {
              "status": "affected",
              "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4",
              "lessThan": "e0c648627322a4c7e018e5c7f837c3c03e297dbb",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "11fab500f86403b2ebf6795feeade6e10302e448",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.15.35",
              "lessThan": "5.15.113",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.17.4",
              "lessThan": "5.18",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/sunrpc/svc_xprt.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.113",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.30",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.3.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.3.*"
            },
            {
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/sunrpc/svc_xprt.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-30T13:16:15.737",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: double free xprt_ctxt while still in use\n\nWhen an RPC request is deferred, the rq_xprt_ctxt pointer is moved out\nof the svc_rqst into the svc_deferred_req.\nWhen the deferred request is revisited, the pointer is copied into\nthe new svc_rqst - and also remains in the svc_deferred_req.\n\nIn the (rare?) case that the request is deferred a second time, the old\nsvc_deferred_req is reused - it still has all the correct content.\nHowever in that case the rq_xprt_ctxt pointer is NOT cleared so that\nwhen xpo_release_xprt is called, the ctxt is freed (UDP) or possible\nadded to a free list (RDMA).\nWhen the deferred request is revisited for a second time, it will\nreference this ctxt which may be invalid, and the free the object a\nsecond time which is likely to oops.\n\nSo change svc_defer() to *always* clear rq_xprt_ctxt, and assert that\nthe value is now stored in the svc_deferred_req."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nSUNRPC: doble liberación de xprt_ctxt mientras aún está en uso\n\nCuando una solicitud RPC es diferida, el puntero rq_xprt_ctxt es movido fuera del svc_rqst hacia el svc_deferred_req.\nCuando la solicitud diferida es revisitada, el puntero es copiado en el nuevo svc_rqst - y también permanece en el svc_deferred_req.\n\nEn el caso (¿raro?) de que la solicitud sea diferida por segunda vez, el antiguo svc_deferred_req es reutilizado - aún tiene todo el contenido correcto.\nSin embargo, en ese caso el puntero rq_xprt_ctxt NO es limpiado de modo que cuando se llama a xpo_release_xprt, el ctxt es liberado (UDP) o posiblemente añadido a una lista de libres (RDMA).\nCuando la solicitud diferida es revisitada por segunda vez, hará referencia a este ctxt el cual puede ser inválido, y liberará el objeto por segunda vez lo que probablemente causará un 'oops'.\n\nAsí que cambie svc_defer() para *siempre* limpiar rq_xprt_ctxt, y afirme que el valor ahora está almacenado en el svc_deferred_req."
    }
  ],
  "lastModified": "2026-08-04T11:16:38.893",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}