FKIE_CVE-2026-43503
Vulnerability from fkie_nvd - Published: 2026-05-23 12:17 - Updated: 2026-08-24 13:18
Severity
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0 (High) - CVSS:3.1/
Summary
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.
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 7.1 | |
| linux | linux_kernel | 7.1 | |
| linux | linux_kernel | 7.1 | |
| linux | linux_kernel | 7.1 |
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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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()-\u003eflags 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()-\u003eflags; 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 \u0027dup to \u003clocal\u003e\u0027 rule -- or any other\nnf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()\u0027d\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\u0027s frag descriptors into the\naccumulator\u0027s 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\u0027s frag_list. Downstream skb_segment() reads only\nskb_shinfo(p)-\u003eflags, and skb_segment_list() reuses each sub-skb\u0027s\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\u0027s flag, and the inner switch that rebinds\nfrag_skb to list_skb on head_skb-frags exhaustion does not fold the\nnew frag_skb\u0027s flag into nskb. Fold frag_skb\u0027s 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 trav\u00e9s 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()-\u003eflags al mover fragmentos del origen al destino. __pskb_copy_fclone() difiere el resto de los metadatos de shinfo a skb_copy_header() despu\u00e9s de copiar los descriptores de fragmentos, pero ese ayudante solo transfiere gso_{size,segs,type} y nunca toca skb_shinfo()-\u003eflags; 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 p\u00e1ginas de propiedad externa o respaldadas por la cach\u00e9 de p\u00e1ginas 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 p\u00e1ginas compartidas deben desviarse a trav\u00e9s de skb_cow_data(). La entrada ESP es uno de esos escritores (esp4.c, esp6.c), y una \u00fanica regla nft \u0027dup to \u003clocal\u003e\u0027 -- 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 cach\u00e9 de p\u00e1ginas de un archivo de solo lectura propiedad de root a trav\u00e9s 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() tambi\u00e9n comparten skb_copy_header() pero linealizan todos los datos paginados en almacenamiento de cabecera reci\u00e9n asignado y emergen con nr_frags == 0, por lo que skb_has_shared_frag() devuelve falso por s\u00ed mismo; no necesitan cambios.\n\nLa misma omisi\u00f3n existe en skb_gro_receive() y skb_gro_receive_list(). El primero mueve los descriptores de fragmentos del skb entrante al \u00faltimo sub-skb del acumulador a trav\u00e9s 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)-\u003eflags, 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 omisi\u00f3n tambi\u00e9n 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 reci\u00e9n asignado. El ayudante pertenece a la misma familia y justifica la misma correcci\u00f3n por coherencia; actualmente no se conoce ning\u00fan escritor in situ del lado TX de TCP que alcance una p\u00e1gina de usuario a trav\u00e9s de esta brecha, pero un futuro consumidor que dependa del marcador regresar\u00eda silenciosamente.\n\nLa misma omisi\u00f3n existe en skb_segment(): la fusi\u00f3n de banderas por iteraci\u00f3n 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."
}
],
"id": "CVE-2026-43503",
"lastModified": "2026-08-24T13:18:47.287",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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