CVE-2026-98541
En el kernel de Linux se ha resuelto la siguiente vulnerabilidad:
fou: rechazar FOU_ATTR_IPPROTO omitido en FOU_ENCAP_DIRECT
El commit 7a9bc9e3f423 ("fou: Don't allow 0 for FOU_ATTR_IPPROTO.") añadió NLA_POLICY_MIN(NLA_U8, 1) a fou_nl_policy[FOU_ATTR_IPPROTO], lo que rechaza con -ERANGE un atributo FOU_ATTR_IPPROTO == 0 suministrado explícitamente.
Sin embargo, FOU_ATTR_IPPROTO es un atributo netlink opcional. Cuando un usuario envía FOU_CMD_ADD con FOU_ATTR_TYPE establecido a FOU_ENCAP_DIRECT y omite por completo FOU_ATTR_IPPROTO, la validación de nla_policy tiene éxito y parse_nl_config() deja cfg->protocol en 0 (por memset(cfg, 0, sizeof(*cfg))). A continuación, fou_create() crea un socket FOU_ENCAP_DIRECT con fou->protocol == 0.
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En fou_udp_recv(), devolver -fou->protocol a udp_queue_rcv_one_skb() provoca la reinyección del protocolo IP cuando fou->protocol > 0, mientras que devolver 0 indica a la capa de túneles UDP que el skb ha sido consumido sin liberarlo. Cuando fou->protocol == 0, cada paquete recibido en el socket devuelve 0 desde fou_udp_recv() y provoca una fuga del sk_buff.
Se rechaza FOU_ENCAP_DIRECT cuando !cfg->protocol en fou_create(), de modo que la creación de un puerto de encapsulación directa sin FOU_ATTR_IPPROTO falla con -EINVAL, dejando sin cambios FOU_CMD_DEL y FOU_CMD_GET (que comparten parse_nl_config()).
Probado en QEMU contra Linux 7.3.0-rc3 enviando una petición FOU_CMD_ADD de Generic Netlink con FOU_ATTR_PORT = 5555 y FOU_ATTR_TYPE = FOU_ENCAP_DIRECT, omitiendo FOU_ATTR_IPPROTO. En el kernel sin parchear, FOU_CMD_ADD tiene éxito (err = 0), FOU_CMD_GET informa de fou->type = 1 y fou->protocol = 0, y el envío de 4000 paquetes UDP a 127.0.0.1:5555 provoca la fuga de los 4000 sk_buff (SUnreclaim en /proc/meminfo pasa de 41456 kB a 59008 kB, +17552 kB); con este parche aplicado, FOU_CMD_ADD se rechaza con -EINVAL (-22).
Traducción automática del texto original de NVD (en inglés).
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días
- 0.21 %
- Percentil entre todas las CVEs puntuadas
- 11
- Fecha de la puntuación
- 20/10/2026
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).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
Mostrar las 8 referencias
- https://git.kernel.org/stable/c/3bcc1624cc1cdcc05b566475d6e848093ab2a8f6
- https://git.kernel.org/stable/c/46b1ffb7e169c7e401dd890b29e55dbc261f8f01
- https://git.kernel.org/stable/c/520cf06b8ea0ba5bcc1b8b982ef07f02b5e56221
- https://git.kernel.org/stable/c/7f4ba56f5d310dd018972916167985010a5d66a1
- https://git.kernel.org/stable/c/8b43f40798bb2758489fbbcae7e841ad4443c213
- https://git.kernel.org/stable/c/b1229b210ef5a39c58be665e6798203751411842
- https://git.kernel.org/stable/c/d22609f3d13fc5baacd92c222731b03c593401db
- https://git.kernel.org/stable/c/fd20220f86947d66d4dba2d76f13a28dbd86ef30
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98541",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "fd20220f86947d66d4dba2d76f13a28dbd86ef30",
"versionType": "git"
},
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "46b1ffb7e169c7e401dd890b29e55dbc261f8f01",
"versionType": "git"
},
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "7f4ba56f5d310dd018972916167985010a5d66a1",
"versionType": "git"
},
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "3bcc1624cc1cdcc05b566475d6e848093ab2a8f6",
"versionType": "git"
},
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "8b43f40798bb2758489fbbcae7e841ad4443c213",
"versionType": "git"
},
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "b1229b210ef5a39c58be665e6798203751411842",
"versionType": "git"
},
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "520cf06b8ea0ba5bcc1b8b982ef07f02b5e56221",
"versionType": "git"
},
{
"status": "affected",
"version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
"lessThan": "d22609f3d13fc5baacd92c222731b03c593401db",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/fou_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/fou_core.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:05.967",
"references": [
{
"url": "https://git.kernel.org/stable/c/3bcc1624cc1cdcc05b566475d6e848093ab2a8f6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/46b1ffb7e169c7e401dd890b29e55dbc261f8f01",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/520cf06b8ea0ba5bcc1b8b982ef07f02b5e56221",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7f4ba56f5d310dd018972916167985010a5d66a1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8b43f40798bb2758489fbbcae7e841ad4443c213",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b1229b210ef5a39c58be665e6798203751411842",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d22609f3d13fc5baacd92c222731b03c593401db",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fd20220f86947d66d4dba2d76f13a28dbd86ef30",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: reject omitted FOU_ATTR_IPPROTO on FOU_ENCAP_DIRECT\n\nCommit 7a9bc9e3f423 (\"fou: Don't allow 0 for FOU_ATTR_IPPROTO.\") added\nNLA_POLICY_MIN(NLA_U8, 1) to fou_nl_policy[FOU_ATTR_IPPROTO], which\nrejects an explicitly supplied FOU_ATTR_IPPROTO == 0 attribute with\n-ERANGE.\n\nHowever, FOU_ATTR_IPPROTO is an optional netlink attribute. When a user\nsends FOU_CMD_ADD with FOU_ATTR_TYPE set to FOU_ENCAP_DIRECT and omits\nFOU_ATTR_IPPROTO entirely, nla_policy validation succeeds and\nparse_nl_config() leaves cfg->protocol as 0 (from memset(cfg, 0,\nsizeof(*cfg))). fou_create() then creates a FOU_ENCAP_DIRECT socket with\nfou->protocol == 0.\n\nIn fou_udp_recv(), returning -fou->protocol to udp_queue_rcv_one_skb()\ntriggers IP protocol resubmission when fou->protocol > 0, whereas\nreturning 0 tells the UDP tunnel layer that the skb was consumed without\nfreeing it. When fou->protocol == 0, every packet received on the socket\nreturns 0 from fou_udp_recv() and leaks the sk_buff.\n\nReject FOU_ENCAP_DIRECT when !cfg->protocol in fou_create() so that\ncreating a direct encapsulation port without FOU_ATTR_IPPROTO fails with\n-EINVAL while leaving FOU_CMD_DEL and FOU_CMD_GET (which share\nparse_nl_config()) unaffected.\n\nTested in QEMU against Linux 7.3.0-rc3 by sending a FOU_CMD_ADD Generic\nNetlink request with FOU_ATTR_PORT = 5555 and FOU_ATTR_TYPE =\nFOU_ENCAP_DIRECT while omitting FOU_ATTR_IPPROTO. On the unfixed kernel,\nFOU_CMD_ADD succeeds (err = 0), FOU_CMD_GET reports fou->type = 1 and\nfou->protocol = 0, and sending 4000 UDP packets to 127.0.0.1:5555 leaks\nall 4000 sk_buffs (SUnreclaim in /proc/meminfo grows from 41456 kB to\n59008 kB, +17552 kB); with this patch applied, FOU_CMD_ADD is rejected\nwith -EINVAL (-22)."
}
],
"lastModified": "2026-10-19T10:19:09.957",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}