CVE-2024-50038
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
netfilter: xtables: avoid NFPROTO_UNSPEC where needed
syzbot managed to call xt_cluster match via ebtables:
Module registers to NFPROTO_UNSPEC, but it assumes ipv4/ipv6 packet processing. As this is only useful to restrict locally terminating TCP/UDP traffic, register this for ipv4 and ipv6 family only.
Pablo points out that this is a general issue, direct users of the set/getsockopt interface can call into targets/matches that were only intended for use with ip(6)tables.
Check all UNSPEC matches and targets for similar issues:
Most matches/targets are changed to register for NFPROTO_IPV4/IPV6, as they are provided for use by ip(6)tables.
Leer descripción completaMostrar menos
The MARK target is also used by arptables, so register for NFPROTO_ARP too.
While at it, bail out if connbytes fails to enable the corresponding conntrack family.
This change passes the selftests in iptables.git.
Detalles técnicos trazas, registros y código del informe original
WARNING: CPU: 0 PID: 11 at net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780 [..] ebt_do_table+0x174b/0x2a40 - matches and targets are fine except if they assume skb_network_header() is valid -- this is only true when called from inet layer: ip(6) stack pulls the ip/ipv6 header into linear data area. - targets that return XT_CONTINUE or other xtables verdicts must be restricted too, they are incompatbile with the ebtables traverser, e.g. EBT_CONTINUE is a completely different value than XT_CONTINUE.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.23%
- Percentil entre todas las CVEs puntuadas: 13
- 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).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/0bfcb7b71e735560077a42847f69597ec7dcc326
- https://git.kernel.org/stable/c/4cdc55ec6222bb195995cc58f7cb46e4d8907056
- https://git.kernel.org/stable/c/85ff9a0f793ca52c527e75cd40a69c948627ebde
- https://git.kernel.org/stable/c/8f482bb7e27b37f1f734bb9a8eeb28b23d59d189
- https://git.kernel.org/stable/c/997f67d813ce0cf5eb3cdb8f124da68141e91b6c
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xtables: avoid NFPROTO_UNSPEC where needed\n\nsyzbot managed to call xt_cluster match via ebtables:\n\n WARNING: CPU: 0 PID: 11 at net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780\n [..]\n ebt_do_table+0x174b/0x2a40\n\nModule registers to NFPROTO_UNSPEC, but it assumes ipv4/ipv6 packet\nprocessing. As this is only useful to restrict locally terminating\nTCP/UDP traffic, register this for ipv4 and ipv6 family only.\n\nPablo points out that this is a general issue, direct users of the\nset/getsockopt interface can call into targets/matches that were only\nintended for use with ip(6)tables.\n\nCheck all UNSPEC matches and targets for similar issues:\n\n- matches and targets are fine except if they assume skb_network_header()\n is valid -- this is only true when called from inet layer: ip(6) stack\n pulls the ip/ipv6 header into linear data area.\n- targets that return XT_CONTINUE or other xtables verdicts must be\n restricted too, they are incompatbile with the ebtables traverser, e.g.\n EBT_CONTINUE is a completely different value than XT_CONTINUE.\n\nMost matches/targets are changed to register for NFPROTO_IPV4/IPV6, as\nthey are provided for use by ip(6)tables.\n\nThe MARK target is also used by arptables, so register for NFPROTO_ARP too.\n\nWhile at it, bail out if connbytes fails to enable the corresponding\nconntrack family.\n\nThis change passes the selftests in iptables.git."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: xtables: evita NFPROTO_UNSPEC donde sea necesario syzbot logró llamar a xt_cluster match a través de ebtables: ADVERTENCIA: CPU: 0 PID: 11 en net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780 [..] ebt_do_table+0x174b/0x2a40 El módulo se registra en NFPROTO_UNSPEC, pero asume el procesamiento de paquetes ipv4/ipv6. Como esto solo es útil para restringir el tráfico TCP/UDP que termina localmente, regístrelo solo para la familia ipv4 e ipv6. Pablo señala que este es un problema general, los usuarios directos de la interfaz set/getsockopt pueden llamar a destinos/coincidencias que solo estaban destinados a usarse con tablas ip(6). Compruebe todas las coincidencias y objetivos UNSPEC para ver si hay problemas similares: - las coincidencias y los objetivos están bien excepto si asumen que skb_network_header() es válido - esto solo es cierto cuando se llama desde la capa inet: la pila ip(6) extrae el encabezado ip/ipv6 en el área de datos lineales. - los objetivos que devuelven XT_CONTINUE u otros veredictos de xtables también deben restringirse, son incompatibles con el traverser de ebtables, por ejemplo, EBT_CONTINUE es un valor completamente diferente de XT_CONTINUE. La mayoría de las coincidencias/objetivos se cambian para registrarse para NFPROTO_IPV4/IPV6, ya que se proporcionan para su uso por ip(6)tables. El objetivo MARK también lo usan arptables, así que regístrese también para NFPROTO_ARP. Mientras tanto, abandone si connbytes no puede habilitar la familia conntrack correspondiente. Este cambio pasa las autopruebas en iptables.git."
}
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"lastModified": "2026-06-17T08:03:26.037",
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