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CVE-2026-46244

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: Fix IPv6 inner_thoff desync In nft_inner_parse_l2l3(), when processing inner IPv6 packets, ipv6_find_hdr() correctly computes the transport header offset traversing all extension headers, but the result is immediately overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only accounts for the IPv6 base header. This creates a desync between inner_thoff (wrong — points to extension header start) and l4proto (correct — e.g., IPPROTO_TCP), enabling transport header forgery and potential firewall bypass. This issue affects stable versions from Linux 6.2. For comparison, the normal (non-inner) IPv6 path correctly preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite ensures that ipv6_find_hdr()'s calculated transport header offset is preserved, thereby fixing the desynchronization.

Severity
CRITICAL
CVSS score
9.1 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-03 18:16:24.430000
Last modified
2026-10-19 20:18:39.337000
View original CVE JSON 
{
  "id": "CVE-2026-46244",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-06-03T18:16:24.430",
  "lastModified": "2026-10-19T20:18:39.337",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_inner: Fix IPv6 inner_thoff desync\n\nIn nft_inner_parse_l2l3(), when processing inner IPv6 packets,\nipv6_find_hdr() correctly computes the transport header offset\ntraversing all extension headers, but the result is immediately\noverwritten with nhoff + sizeof(_ip6h) (40 bytes), which only\naccounts for the IPv6 base header. This creates a desync between\ninner_thoff (wrong — points to extension header start) and l4proto\n(correct — e.g., IPPROTO_TCP), enabling transport header forgery\nand potential firewall bypass. This issue affects stable versions\nfrom Linux 6.2.\n\nFor comparison, the normal (non-inner) IPv6 path correctly\npreserves ipv6_find_hdr()'s result. Removing the incorrect overwrite\nensures that ipv6_find_hdr()'s calculated transport header offset is\npreserved, thereby fixing the desynchronization."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nft_inner: Corregir la desincronización de inner_thoff de IPv6\n\nEn nft_inner_parse_l2l3(), al procesar paquetes IPv6 internos, ipv6_find_hdr() calcula correctamente el desplazamiento del encabezado de transporte atravesando todos los encabezados de extensión, pero el resultado es inmediatamente sobrescrito con nhoff + sizeof(_ip6h) (40 bytes), lo que solo tiene en cuenta el encabezado base de IPv6. Esto crea una desincronización entre inner_thoff (incorrecto - apunta al inicio del encabezado de extensión) y l4proto (correcto - p. ej., IPPROTO_TCP), lo que permite la falsificación de encabezados de transporte y una posible omisión del cortafuegos. Este problema afecta a versiones estables a partir de Linux 6.2.\n\nA modo de comparación, la ruta IPv6 normal (no interna) conserva correctamente el resultado de ipv6_find_hdr(). Eliminar la sobrescritura incorrecta asegura que el desplazamiento del encabezado de transporte calculado por ipv6_find_hdr() se preserve, corrigiendo así la desincronización."
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