CVE-2026-46330

Estado: AnalizadaAlta (7.8)—

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

Revert "net/smc: Introduce TCP ULP support"

This reverts commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40.

As reported by Al Viro, the TCP ULP support for SMC is fundamentally broken. The implementation attempts to convert an active TCP socket into an SMC socket by modifying the underlying `struct file`, dentry, and inode in-place, which violates core VFS invariants that assume these structures are immutable for an open file, creating a risk of use after free errors and general system instability.

Given the severity of this design flaw and the fact that cleaner alternatives (e.g., LD_PRELOAD, BPF) exist for legacy application transparency, the correct course of action is to remove this feature entirely.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.17%
Percentil entre todas las CVEs puntuadas: 5
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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %
Impacto secundarioT1499.004 Application or System Exploitationimpact60 %

AV:L/PR:L sin UI permite escalada local. Use-after-free en VFS puede permitir ejecución de código o DoS del kernel; impacto de confidencialidad/integridad/disponibilidad máximos (C:H/I:H/A:H).

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-46330",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "d7cd421da9da2cc7b4d25b8537f66db5c8331c40",
              "lessThan": "6c505d95c69e27dbf28fea29dc84d2498d69515c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d7cd421da9da2cc7b4d25b8537f66db5c8331c40",
              "lessThan": "df31a6b0a3057e66994ad6ccf5d95b9b9514f033",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/smc/af_smc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/smc/af_smc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-06-09T14:16:42.723",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/6c505d95c69e27dbf28fea29dc84d2498d69515c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/df31a6b0a3057e66994ad6ccf5d95b9b9514f033",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"net/smc: Introduce TCP ULP support\"\n\nThis reverts commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40.\n\nAs reported by Al Viro, the TCP ULP support for SMC is fundamentally\nbroken. The implementation attempts to convert an active TCP socket\ninto an SMC socket by modifying the underlying `struct file`, dentry,\nand inode in-place, which violates core VFS invariants that assume\nthese structures are immutable for an open file, creating a risk of\nuse after free errors and general system instability.\n\nGiven the severity of this design flaw and the fact that cleaner\nalternatives (e.g., LD_PRELOAD, BPF) exist for legacy application\ntransparency, the correct course of action is to remove this feature\nentirely."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRevertir  net/smc: Introduce TCP ULP support \n\nEsto revierte el commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40.\n\nSegún lo informado por Al Viro, el soporte TCP ULP para SMC está fundamentalmente roto. La implementación intenta convertir un socket TCP activo en un socket SMC modificando in situ la 'struct file', dentry e inode subyacentes, lo que viola las invariantes centrales de VFS que asumen que estas estructuras son inmutables para un archivo abierto, creando un riesgo de errores de uso después de liberar (use after free) e inestabilidad general del sistema.\n\nDada la gravedad de este defecto de diseño y el hecho de que existen alternativas más limpias (p. ej., LD_PRELOAD, BPF) para la transparencia de aplicaciones heredadas, el curso de acción correcto es eliminar esta característica por completo."
    }
  ],
  "lastModified": "2026-07-23T08:10:00.137",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7364BC6F-BA7F-41F3-98E5-584998F67723",
              "versionEndExcluding": "6.19.4",
              "versionStartIncluding": "5.17"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}