CVE-2026-74616

Estado: RecibidaCrítica (9.8)—

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

xdp: reject clones that overrun skb_shared_info tailroom

xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer.

The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata.

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Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.

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: 0.51%
Percentil entre todas las CVEs puntuadas: 42
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 principalT1565.001 Stored Data Manipulationimpact70 %
Impacto secundarioT1499.004 Application or System Exploitationimpact65 %

Buffer overflow en XDP (red, sin autenticación, CVSS crítico). Corrupción de metadatos XDP y posible DoS por sobrescritura de memoria compartida en skb_shared_info.

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 Vulnerability Scanning Restrict File and Directory Permissions Privileged Account Management Remote Data Storage Network Segmentation

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-2026-74616",
  "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"
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        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
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  "published": "2026-08-22T16:16:34.280",
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    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: reject clones that overrun skb_shared_info tailroom\n\nxdpf_clone() clones broadcast copies into a single page and sets\nframe_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that\npage like a normal XDP frame and expects the usual skb_shared_info\ntailroom at the end of the buffer.\n\nThe current check only rejects frames whose linear xdp_frame header,\nheadroom, and packet data exceed PAGE_SIZE. A source frame backed by a\nlarger allocation can still satisfy that check while extending into the\nclone's required shared-info area. When such a clone is converted back\ninto an skb, build_skb_around() places skb_shared_info over live packet\nbytes and later writes can corrupt XDP return metadata.\n\nReject clones unless their linear area fits inside\nSKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already\nenforced by the XDP-to-skb conversion path."
    }
  ],
  "lastModified": "2026-08-25T06:18:39.963",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}