CVE-2026-43503
Estado: ModificadaAlta (8.8)—
In the Linux kernel, the following vulnerability has been resolved:
net: skbuff: propagate shared-frag marker through frag-transfer helpers
Two frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail to propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()->flags when moving frags from source to destination. __pskb_copy_fclone() defers the rest of the shinfo metadata to skb_copy_header() after copying frag descriptors, but that helper only carries over gso_{size,segs, type} and never touches skb_shinfo()->flags; skb_shift() moves frag descriptors directly and leaves flags untouched. As a result, the destination skb keeps a reference to the same externally-owned or page-cache-backed pages while reporting skb_has_shared_frag() as false.
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The mismatch is harmful in any in-place writer that uses skb_has_shared_frag() to decide whether shared pages must be detoured through skb_cow_data(). ESP input is one such writer (esp4.c, esp6.c), and a single nft 'dup to <local>' rule -- or any other nf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()'d skb in esp_input() with the marker stripped, letting an unprivileged user write into the page cache of a root-owned read-only file via authencesn-ESN stray writes.
Set SKBFL_SHARED_FRAG on the destination whenever frag descriptors were actually moved from the source. skb_copy() and skb_copy_expand() share skb_copy_header() too but linearize all paged data into freshly allocated head storage and emerge with nr_frags == 0, so skb_has_shared_frag() returns false on its own; they need no change.
The same omission exists in skb_gro_receive() and skb_gro_receive_list(). The former moves the incoming skb's frag descriptors into the accumulator's last sub-skb via two paths (a direct frag-move loop and the head_frag + memcpy path); the latter chains the incoming skb whole onto p's frag_list. Downstream skb_segment() reads only skb_shinfo(p)->flags, and skb_segment_list() reuses each sub-skb's shinfo as the nskb -- both p and lp must carry the marker.
The same omission also exists in tcp_clone_payload(), which builds an MTU probe skb by moving frag descriptors from skbs on sk_write_queue into a freshly allocated nskb. The helper falls into the same family and warrants the same fix for consistency; no TCP TX-side in-place writer is currently known to reach a user page through this gap, but a future consumer depending on the marker would regress silently.
The same omission exists in skb_segment(): the per-iteration flag merge takes only head_skb's flag, and the inner switch that rebinds frag_skb to list_skb on head_skb-frags exhaustion does not fold the new frag_skb's flag into nskb. Fold frag_skb's flag at both sites so segments drawing frags from frag_list members carry the marker.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Puntuación base: 8.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.99%
- Percentil entre todas las CVEs puntuadas: 80
- 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.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1565.001Stored Data Manipulationimpact75 % - Impacto secundario
T1499.004Application or System Exploitationimpact60 %
Escalada de privilegios local en kernel Linux (AV:L, PR:L) permitiendo escritura no autorizada en caché de páginas de archivos raíz mediante fallos en propagación de marcadores de fragmentos compartidos en ESP/nftables.
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
- NVD-CWE-noinfo
- CWE-664
Referencias
- https://git.kernel.org/stable/c/12401fcfb01f53ccc63ab0a3246570fe8f3105ee
- https://git.kernel.org/stable/c/179f1852bdedc300e373e807cc102cd81feff196
- https://git.kernel.org/stable/c/48f6a5356a33dd78e7144ae1faef95ffc990aae0
- https://git.kernel.org/stable/c/989214c66884d70716d83dc1d0bf5e16287bf349
- https://git.kernel.org/stable/c/9bc9d6d6967a2239aa57af2aa53554eddd640d20
- https://git.kernel.org/stable/c/fbeab9555564a1b98e8582cd106dfe46c4606991
- https://git.kernel.org/stable/c/fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8
- https://git.kernel.org/stable/c/ff375cc75f9167168db38e0464a482d5fbc8d81d
- https://access.redhat.com/errata/RHSA-2026:19521
- https://access.redhat.com/errata/RHSA-2026:19540
- https://access.redhat.com/errata/RHSA-2026:19568
- https://access.redhat.com/errata/RHSA-2026:19569
- https://access.redhat.com/errata/RHSA-2026:19664
- https://access.redhat.com/errata/RHSA-2026:19666
- https://access.redhat.com/errata/RHSA-2026:19705
- https://access.redhat.com/errata/RHSA-2026:19711
- https://access.redhat.com/errata/RHSA-2026:19875
- https://access.redhat.com/errata/RHSA-2026:20051
- https://access.redhat.com/errata/RHSA-2026:20054
- https://access.redhat.com/errata/RHSA-2026:20087
- https://access.redhat.com/errata/RHSA-2026:20129
- https://access.redhat.com/errata/RHSA-2026:20130
- https://access.redhat.com/errata/RHSA-2026:20299
- https://access.redhat.com/errata/RHSA-2026:20593
- https://access.redhat.com/errata/RHSA-2026:21656
- https://access.redhat.com/errata/RHSA-2026:21690
- https://access.redhat.com/errata/RHSA-2026:21695
- https://access.redhat.com/errata/RHSA-2026:21702
- https://access.redhat.com/errata/RHSA-2026:23233
- https://access.redhat.com/errata/RHSA-2026:23240
- https://access.redhat.com/errata/RHSA-2026:23245
- https://access.redhat.com/errata/RHSA-2026:23468
- https://access.redhat.com/errata/RHSA-2026:23469
- https://access.redhat.com/errata/RHSA-2026:23470
- https://access.redhat.com/errata/RHSA-2026:23471
- https://access.redhat.com/errata/RHSA-2026:24814
- https://access.redhat.com/errata/RHSA-2026:25044
- https://access.redhat.com/errata/RHSA-2026:33486
- https://access.redhat.com/security/cve/CVE-2026-43503
- https://bugzilla.redhat.com/show_bug.cgi?id=2480902
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43503.json
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker through frag-transfer helpers\n\nTwo frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail\nto propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()->flags when\nmoving frags from source to destination. __pskb_copy_fclone() defers\nthe rest of the shinfo metadata to skb_copy_header() after copying\nfrag descriptors, but that helper only carries over gso_{size,segs,\ntype} and never touches skb_shinfo()->flags; skb_shift() moves frag\ndescriptors directly and leaves flags untouched. As a result, the\ndestination skb keeps a reference to the same externally-owned or\npage-cache-backed pages while reporting skb_has_shared_frag() as\nfalse.\n\nThe mismatch is harmful in any in-place writer that uses\nskb_has_shared_frag() to decide whether shared pages must be detoured\nthrough skb_cow_data(). ESP input is one such writer (esp4.c,\nesp6.c), and a single nft 'dup to <local>' rule -- or any other\nnf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()'d\nskb in esp_input() with the marker stripped, letting an unprivileged\nuser write into the page cache of a root-owned read-only file via\nauthencesn-ESN stray writes.\n\nSet SKBFL_SHARED_FRAG on the destination whenever frag descriptors\nwere actually moved from the source. skb_copy() and skb_copy_expand()\nshare skb_copy_header() too but linearize all paged data into freshly\nallocated head storage and emerge with nr_frags == 0, so\nskb_has_shared_frag() returns false on its own; they need no change.\n\nThe same omission exists in skb_gro_receive() and skb_gro_receive_list().\nThe former moves the incoming skb's frag descriptors into the\naccumulator's last sub-skb via two paths (a direct frag-move loop and\nthe head_frag + memcpy path); the latter chains the incoming skb whole\nonto p's frag_list. Downstream skb_segment() reads only\nskb_shinfo(p)->flags, and skb_segment_list() reuses each sub-skb's\nshinfo as the nskb -- both p and lp must carry the marker.\n\nThe same omission also exists in tcp_clone_payload(), which builds an\nMTU probe skb by moving frag descriptors from skbs on sk_write_queue\ninto a freshly allocated nskb. The helper falls into the same family\nand warrants the same fix for consistency; no TCP TX-side in-place\nwriter is currently known to reach a user page through this gap, but\na future consumer depending on the marker would regress silently.\n\nThe same omission exists in skb_segment(): the per-iteration flag\nmerge takes only head_skb's flag, and the inner switch that rebinds\nfrag_skb to list_skb on head_skb-frags exhaustion does not fold the\nnew frag_skb's flag into nskb. Fold frag_skb's flag at both sites\nso segments drawing frags from frag_list members carry the marker."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: skbuff: propagar el marcador de fragmento compartido a través de los ayudantes de transferencia de fragmentos\n\nDos ayudantes de transferencia de fragmentos (__pskb_copy_fclone() y skb_shift()) no logran propagar el bit SKBFL_SHARED_FRAG en skb_shinfo()->flags al mover fragmentos del origen al destino. __pskb_copy_fclone() difiere el resto de los metadatos de shinfo a skb_copy_header() después de copiar los descriptores de fragmentos, pero ese ayudante solo transfiere gso_{size,segs,type} y nunca toca skb_shinfo()->flags; skb_shift() mueve los descriptores de fragmentos directamente y deja las banderas intactas. Como resultado, el skb de destino mantiene una referencia a las mismas páginas de propiedad externa o respaldadas por la caché de páginas mientras informa skb_has_shared_frag() como falso.\n\nLa falta de coincidencia es perjudicial en cualquier escritor in situ que utiliza skb_has_shared_frag() para decidir si las páginas compartidas deben desviarse a través de skb_cow_data(). La entrada ESP es uno de esos escritores (esp4.c, esp6.c), y una única regla nft 'dup to <local>' -- o cualquier otro llamador de nf_dup_ipv4() / xt_TEE -- es suficiente para que un skb copiado con pskb_copy() llegue a esp_input() con el marcador eliminado, permitiendo que un usuario sin privilegios escriba en la caché de páginas de un archivo de solo lectura propiedad de root a través de escrituras errantes de authencesn-ESN.\n\nEstablecer SKBFL_SHARED_FRAG en el destino siempre que los descriptores de fragmentos se hayan movido realmente del origen. skb_copy() y skb_copy_expand() también comparten skb_copy_header() pero linealizan todos los datos paginados en almacenamiento de cabecera recién asignado y emergen con nr_frags == 0, por lo que skb_has_shared_frag() devuelve falso por sí mismo; no necesitan cambios.\n\nLa misma omisión existe en skb_gro_receive() y skb_gro_receive_list(). El primero mueve los descriptores de fragmentos del skb entrante al último sub-skb del acumulador a través de dos rutas (un bucle directo de movimiento de fragmentos y la ruta head_frag + memcpy); el segundo encadena el skb entrante completo a la frag_list de p. skb_segment() aguas abajo solo lee skb_shinfo(p)->flags, y skb_segment_list() reutiliza el shinfo de cada sub-skb como el nskb -- tanto p como lp deben llevar el marcador.\n\nLa misma omisión también existe en tcp_clone_payload(), que construye un skb de sondeo de MTU moviendo descriptores de fragmentos de skbs en sk_write_queue a un nskb recién asignado. El ayudante pertenece a la misma familia y justifica la misma corrección por coherencia; actualmente no se conoce ningún escritor in situ del lado TX de TCP que alcance una página de usuario a través de esta brecha, pero un futuro consumidor que dependa del marcador regresaría silenciosamente.\n\nLa misma omisión existe en skb_segment(): la fusión de banderas por iteración toma solo la bandera de head_skb, y el switch interno que reasigna frag_skb a list_skb al agotarse los fragmentos de head_skb no incorpora la bandera del nuevo frag_skb en nskb. Incorporar la bandera de frag_skb en ambos sitios para que los segmentos que extraen fragmentos de los miembros de frag_list lleven el marcador."
}
],
"lastModified": "2026-08-24T13:18:47.287",
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}
],
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}
]
}
],
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}