CVE-2026-46322

Estado: AnalizadaAlta (7.1)—

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

tun: free page on build_skb failure in tun_xdp_one()

When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM and jumps to the out label, which returns without freeing the page that vhost_net_build_xdp() allocated for the frame. As with the short-frame rejection path, tun_sendmsg() discards the per-buffer error and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page. Each build_skb() failure in a batch leaks one page-frag chunk.

Free the page before taking the error path, matching the put_page() the other error exits of tun_xdp_one() already perform.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.19%
Percentil entre todas las CVEs puntuadas: 7
Fecha de la puntuación: 5/10/2026

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 escalation45 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %

Vulnerabilidad local (AV:L/PR:N) que causa DoS por agotamiento de memoria (fuga de páginas), afectando disponibilidad de sistema.

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 Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on build_skb failure in tun_xdp_one()\n\nWhen build_skb() fails in tun_xdp_one(), the function sets ret to\n-ENOMEM and jumps to the out label, which returns without freeing the\npage that vhost_net_build_xdp() allocated for the frame. As with the\nshort-frame rejection path, tun_sendmsg() discards the per-buffer error\nand still returns total_len, so vhost_tx_batch() takes the success path\nand never frees the page. Each build_skb() failure in a batch leaks one\npage-frag chunk.\n\nFree the page before taking the error path, matching the put_page() the\nother error exits of tun_xdp_one() already perform."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntun: liberar página en caso de fallo de build_skb() en tun_xdp_one()\n\nCuando build_skb() falla en tun_xdp_one(), la función establece ret en -ENOMEM y salta a la etiqueta out, la cual retorna sin liberar la página que vhost_net_build_xdp() asignó para el frame. Al igual que con la ruta de rechazo de frames cortos, tun_sendmsg() descarta el error por búfer y aún retorna total_len, por lo que vhost_tx_batch() toma la ruta de éxito y nunca libera la página. Cada fallo de build_skb() en un lote fuga un fragmento de página.\n\nLiberar la página antes de tomar la ruta de error, coincidiendo con el put_page() que las otras salidas de error de tun_xdp_one() ya realizan."
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