CVE-2026-43503 (GCVE-0-2026-43503)
Vulnerability from cvelistv5 – Published: 2026-05-23 11:44 – Updated: 2026-07-15 00:55
VLAI
EPSS
VEX
Title
net: skbuff: propagate shared-frag marker through frag-transfer helpers
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.
Severity
CWE
- CWE-664 - Improper Control of a Resource Through its Lifetime
Assigner
References
41 references
Impacted products
37 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < fbeab9555564a1b98e8582cd106dfe46c4606991
(git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 179f1852bdedc300e373e807cc102cd81feff196 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 12401fcfb01f53ccc63ab0a3246570fe8f3105ee (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 989214c66884d70716d83dc1d0bf5e16287bf349 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < ff375cc75f9167168db38e0464a482d5fbc8d81d (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 9bc9d6d6967a2239aa57af2aa53554eddd640d20 (git) Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 48f6a5356a33dd78e7144ae1faef95ffc990aae0 (git) |
|
| Linux | Linux |
Affected:
3.9
Unaffected: 0 , < 3.9 (semver) Unaffected: 5.10.257 , ≤ 5.10.* (semver) Unaffected: 5.15.208 , ≤ 5.15.* (semver) Unaffected: 6.1.174 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
|
| Red Hat | NVIDIA for RHEL 10 |
Unaffected:
0:6.12.0-211.8.el10nv , < *
(rpm)
Unaffected: 0:6.12.0-231.12.el10nv , < * (rpm) cpe:/a:redhat:enterprise_linux_nvidia:10::el10 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:6.12.0-211.16.1.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:6.12.0-55.75.1.el10_0 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:4.18.0-553.125.1.rt7.466.el8_10 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::nfv |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:4.18.0-553.125.1.el8_10 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
0:4.18.0-305.192.1.el8_4 , < *
(rpm)
cpe:/o:redhat:rhel_aus:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
0:4.18.0-305.192.1.el8_4 , < *
(rpm)
cpe:/o:redhat:rhel_eus_long_life:8.4 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
0:4.18.0-372.193.1.el8_6 , < *
(rpm)
cpe:/o:redhat:rhel_aus:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service |
Unaffected:
0:4.18.0-372.193.1.el8_6 , < *
(rpm)
cpe:/o:redhat:rhel_tus:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions |
Unaffected:
0:4.18.0-372.193.1.el8_6 , < *
(rpm)
cpe:/o:redhat:rhel_e4s:8.6 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
0:4.18.0-477.143.1.el8_8 , < *
(rpm)
cpe:/o:redhat:rhel_tus:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
0:4.18.0-477.143.1.el8_8 , < *
(rpm)
cpe:/o:redhat:rhel_e4s:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
cpe:/o:redhat:rhel_e4s:8.8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:5.14.0-687.10.1.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions |
Unaffected:
0:5.14.0-70.180.1.el9_0 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.0 |
|
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions |
Unaffected:
0:5.14.0-70.180.1.rt21.252.el9_0 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.0::nfv |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:5.14.0-284.172.1.el9_2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:5.14.0-284.172.1.rt14.457.el9_2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2::nfv |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
cpe:/o:redhat:rhel_e4s:9.2 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
0:5.14.0-427.126.1.el9_4 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
cpe:/o:redhat:rhel_e4s:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:5.14.0-570.116.1.el9_6 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
cpe:/o:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.12 |
Unaffected:
412.86.202605271418-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.12::el8 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.13 |
Unaffected:
413.92.202605271328-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.13::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.15 |
Unaffected:
415.92.202606030318-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.15::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.16 |
Unaffected:
416.94.202605200242-0 , < *
(rpm)
Unaffected: 416.94.202606051757-0 , < * (rpm) cpe:/a:redhat:openshift:4.16::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.18 |
Unaffected:
418.94.202605260517-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.18::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.19 |
Unaffected:
4.19.9.6.202606031700-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.19::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.20 |
Unaffected:
4.20.9.6.202605270908-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.20::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.21 |
Unaffected:
4.21.9.6.202606030721-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.21::el9 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
{
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"cpes": [
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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."
}
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"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-14T17:45:49.109Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/fbeab9555564a1b98e8582cd106dfe46c4606991"
},
{
"url": "https://git.kernel.org/stable/c/179f1852bdedc300e373e807cc102cd81feff196"
},
{
"url": "https://git.kernel.org/stable/c/12401fcfb01f53ccc63ab0a3246570fe8f3105ee"
},
{
"url": "https://git.kernel.org/stable/c/989214c66884d70716d83dc1d0bf5e16287bf349"
},
{
"url": "https://git.kernel.org/stable/c/fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8"
},
{
"url": "https://git.kernel.org/stable/c/ff375cc75f9167168db38e0464a482d5fbc8d81d"
},
{
"url": "https://git.kernel.org/stable/c/9bc9d6d6967a2239aa57af2aa53554eddd640d20"
},
{
"url": "https://git.kernel.org/stable/c/48f6a5356a33dd78e7144ae1faef95ffc990aae0"
}
],
"title": "net: skbuff: propagate shared-frag marker through frag-transfer helpers",
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43503",
"datePublished": "2026-05-23T11:44:01.103Z",
"dateReserved": "2026-05-01T14:12:56.014Z",
"dateUpdated": "2026-07-15T00:55:44.928Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
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"epss": {
"cve": "CVE-2026-43503",
"date": "2026-07-23",
"epss": "0.00135",
"percentile": "0.0336"
},
"microsoft_vex": {
"current_release_date": "2026-06-09T14:40:55.000Z",
"cve": "CVE-2026-43503",
"id": "msrc_CVE-2026-43503",
"initial_release_date": "2026-05-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "net: skbuff: propagate shared-frag marker through frag-transfer helpers",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-43503.json",
"version": "3"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-43503\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-23T12:17:02.547\",\"lastModified\":\"2026-07-23T11:10:00.120\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/gro.c\",\"net/core/skbuff.c\",\"net/ipv4/tcp_output.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"fbeab9555564a1b98e8582cd106dfe46c4606991\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"179f1852bdedc300e373e807cc102cd81feff196\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"12401fcfb01f53ccc63ab0a3246570fe8f3105ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"989214c66884d70716d83dc1d0bf5e16287bf349\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"fc6eb39c55e97df2f94ad974b8a5bbcd019da2c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"ff375cc75f9167168db38e0464a482d5fbc8d81d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"9bc9d6d6967a2239aa57af2aa53554eddd640d20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\"lessThan\":\"48f6a5356a33dd78e7144ae1faef95ffc990aae0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/gro.c\",\"net/core/skbuff.c\",\"net/ipv4/tcp_output.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.257\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.208\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.174\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red 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"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-07-02T13:09:42+00:00",
"cve": "CVE-2026-43503",
"id": "CVE-2026-43503",
"initial_release_date": "2026-05-23T00:00:00+00:00",
"product_status:fixed": "2576",
"product_status:known_not_affected": "43",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: skbuff: propagate shared-frag marker through frag-transfer helpers",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43503.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-07-15T18:52:02Z",
"cve": "CVE-2026-43503",
"id": "CVE-2026-43503",
"initial_release_date": "2026-05-24T00:49:46Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "431",
"product_status:known_not_affected": "4",
"product_status:recommended": "794",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43503",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43503.json",
"version": "35"
}
}
}
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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.
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