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CVE-2026-72463

Estado: RecibidaCrítica (9.8)—

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

xfrm: Fix dev use-after-free in xfrm async resumption

xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below:

unregister_netdevice: waiting for vti1 to become free. Usage count = -2

Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races.

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:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). La vulnerabilidad de use-after-free en xfrm kernel provoca DoS por crash/refcnt corruption (T1499.004) y potencial Resource Hijacking en contexto kernel (T1578.003).

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 TrafficVulnerability ScanningUser Account ManagementPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over Network

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-2026-72463",
  "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": "4236c30b437b80f673b9e08c8fae38b8d471ac9e",
              "lessThan": "fed4d3195a31125566876952ce66113ec1eb9008",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0f451b43c88bf2b9c038b414be580efee42e031b",
              "lessThan": "1acd93259b6be269e26be5d71c224bccd1f8352f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1c428b03840094410c5fb6a5db30640486bbbfcb",
              "lessThan": "63a30015199912bd5055bead8001b1ae68a67cdb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1c428b03840094410c5fb6a5db30640486bbbfcb",
              "lessThan": "8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5002beda5cac69d522dc54da0d5d463ed9c963d2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.12.94",
              "lessThan": "6.12.112",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.18.23",
              "lessThan": "6.18.54",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.19.13",
              "lessThan": "6.20",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/ipv4/xfrm4_input.c",
            "net/ipv6/xfrm6_input.c",
            "net/xfrm/xfrm_input.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv4/xfrm4_input.c",
            "net/ipv6/xfrm6_input.c",
            "net/xfrm/xfrm_input.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:20.303",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1acd93259b6be269e26be5d71c224bccd1f8352f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fed4d3195a31125566876952ce66113ec1eb9008",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix dev use-after-free in xfrm async resumption\n\nxfrm async resumption hold skb->dev refcnt until after transport_finish.\nHowever, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking\ndevice reference, such as vti_rcv_cb. The subsequent async resumption\nwill decrement the tunnel device's reference count, which lead to uaf\nof tunnel dev and refcnt leak of orig dev as below:\n\nunregister_netdevice: waiting for vti1 to become free. Usage count = -2\n\nStash the original skb->dev to fix refcnt imbalance. The new skb->dev set\nby xfrm_rcv_cb can race with device teardown. Extend rcu protection over\nxfrm_rcv_cb and transport_finish to prevent races."
    }
  ],
  "lastModified": "2026-10-03T11:17:37.723",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}