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CVE-2026-46323

Estado: ModificadaAlta (7.8)—

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

net: gro: don't merge zcopy skbs

skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag.

When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF.

When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

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.

Vulnerabilidad local (AV:L, PR:L) de Use-After-Free (CWE-416) en kernel Linux que permite ejecutar código con privilegios elevados al manipular referencias de páginas en skbs de zero-copy.

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

Threat Intelligence ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gro: don't merge zcopy skbs\n\nskb_gro_receive() can currently copy frags between the source and GRO\nskb, without checking the zerocopy status, and in particular the\nSKBFL_MANAGED_FRAG_REFS flag.\n\nWhen SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference\non the pages in shinfo->frags. Appending those frags to another skb's\nfrags without fixing up the page refcount can lead to UAF.\n\nWhen either the last skb in the GRO chain (the one we would append\nfrags to) or the source skb is zerocopy, don't merge the skbs."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: gro: no fusionar skbs zcopy\n\nskb_gro_receive() actualmente puede copiar fragmentos entre el skb de origen y el GRO, sin verificar el estado de zerocopy, y en particular el indicador SKBFL_MANAGED_FRAG_REFS.\n\nCuando SKBFL_MANAGED_FRAG_REFS está establecido, el skb no mantiene una referencia en las páginas en shinfo->frags. Adjuntar esos fragmentos a los fragmentos de otro skb sin corregir el recuento de referencias de la página puede llevar a UAF.\n\nCuando el último skb en la cadena GRO (aquel al que adjuntaríamos fragmentos) o el skb de origen es zerocopy, no fusionar los skbs."
    }
  ],
  "lastModified": "2026-09-08T09:18:10.030",
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