CVE-2026-23351
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_pipapo: split gc into unlink and reclaim phase
We must split GC in an unlink and a reclaim phase.
We cannot queue elements for freeing until pointers have been swapped. Expired elements are still exposed to both the packet path and userspace dumpers via the live copy of the data structure.
call_rcu() does not protect us: dump operations or element lookups starting after call_rcu has fired can still observe the free'd element, unless the commit phase has made enough progress to swap the clone and live pointers before any new reader has picked up the old version.
Detalles técnicos trazas, registros y código del informe original
Yiming Qian reports Use-after-free in the pipapo set type:
Under a large number of expired elements, commit-time GC can run for a very
long time in a non-preemptible context, triggering soft lockup warnings and
RCU stall reports (local denial of service).
This a similar approach as done recently for the rbtree backend in commit
35f83a75529a ("netfilter: nft_set_rbtree: don't gc elements on insert").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: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- 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.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact80 %
Vulnerabilidad use-after-free (CWE-416) en kernel Linux con acceso local no privilegiado (AV:L/PR:L). El impacto es DoS por soft lockup y RCU stall (negación de servicio local), no ejecución de código.
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
Tecnologías afectadas (1)
CWE
- CWE-416
Referencias
- https://git.kernel.org/stable/c/16f3595c0441d87dfa005c47d8f95be213afaa9e
- https://git.kernel.org/stable/c/500a50a301ce962b019ab95053ac70264fec2c21
- https://git.kernel.org/stable/c/65ca51b9fb85477ab92a04295aed34b38f7c062e
- https://git.kernel.org/stable/c/7864c667aed01a58b87ca518a631322cd0ac34c0
- https://git.kernel.org/stable/c/9df95785d3d8302f7c066050117b04cd3c2048c2
- https://git.kernel.org/stable/c/aff13667708dfa0dce136b8efd81baa9fa6ef261
- https://git.kernel.org/stable/c/c0f1f85097ac2b6e7d750fe4d05807985cd3fd3a
- https://git.kernel.org/stable/c/c12d570d71920903a1a0468b7d13b085203d0c93
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo: split gc into unlink and reclaim phase\n\nYiming Qian reports Use-after-free in the pipapo set type:\n Under a large number of expired elements, commit-time GC can run for a very\n long time in a non-preemptible context, triggering soft lockup warnings and\n RCU stall reports (local denial of service).\n\nWe must split GC in an unlink and a reclaim phase.\n\nWe cannot queue elements for freeing until pointers have been swapped.\nExpired elements are still exposed to both the packet path and userspace\ndumpers via the live copy of the data structure.\n\ncall_rcu() does not protect us: dump operations or element lookups starting\nafter call_rcu has fired can still observe the free'd element, unless the\ncommit phase has made enough progress to swap the clone and live pointers\nbefore any new reader has picked up the old version.\n\nThis a similar approach as done recently for the rbtree backend in commit\n35f83a75529a (\"netfilter: nft_set_rbtree: don't gc elements on insert\")."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nft_set_pipapo: dividir la recolección de basura en una fase de desvinculación y una fase de recuperación\n\nYiming Qian informa de un uso después de liberación en el tipo de conjunto pipapo:\nBajo un gran número de elementos caducados, la recolección de basura en tiempo de commit puede ejecutarse durante mucho tiempo en un contexto no preemptivo, lo que desencadena advertencias de soft lockup e informes de bloqueo de RCU (denegación de servicio local).\n\nDebemos dividir la recolección de basura en una fase de desvinculación y una de recuperación.\n\nNo podemos poner en cola elementos para su liberación hasta que los punteros hayan sido intercambiados.\nLos elementos caducados todavía están expuestos tanto a la ruta de paquetes como a los volcadores del espacio de usuario a través de la copia activa de la estructura de datos.\n\ncall_rcu() no nos protege: las operaciones de volcado o las búsquedas de elementos que comienzan después de que call_rcu se haya activado aún pueden observar el elemento liberado, a menos que la fase de commit haya progresado lo suficiente como para intercambiar los punteros de clonación y activos antes de que cualquier nuevo lector haya tomado la versión antigua.\n\nEste es un enfoque similar al realizado recientemente para el backend rbtree en el commit 35f83a75529a ('netfilter: nft_set_rbtree: no recolectar elementos en la inserción')."
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"lastModified": "2026-07-14T13:18:30.660",
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