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CVE-2026-43501

Estado: ModificadaCrítica (9.8)—

In the Linux kernel, the following vulnerability has been resolved:

ipv6: rpl: reserve mac_len headroom when recompressed SRH grows

ipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps the next segment into ipv6_hdr->daddr, recompresses, then pulls the old header and pushes the new one plus the IPv6 header back. The recompressed header can be larger than the received one when the swap reduces the common-prefix length the segments share with daddr (CmprI=0, CmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes).

pskb_expand_head() was gated on segments_left == 0, so on earlier segments the push consumed unchecked headroom. Once skb_push() leaves fewer than skb->mac_len bytes in front of data, skb_mac_header_rebuild()'s call to:

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will store (data - head) - mac_len into the u16 mac_header field, which wraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB past skb->head.

A single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two segment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one pass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv.

Fix this by expanding the head whenever the remaining room is less than the push size plus mac_len, and request that much extra so the rebuilt MAC header fits afterwards.

Detalles técnicos trazas, registros y código del informe original
	skb_set_mac_header(skb, -skb->mac_len);

CVSS

Probabilidad de explotación (EPSS)

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N indica explotación remota sin privilegios (T1190). Buffer overflow (CWE-787) en kernel Linux permite escritura OOB de ~64KiB causando crash (DoS) o ejecución de código con privilegios de kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Tecnologías afectadas (1)

CWE

Referencias

JSON original (NVD)

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  "published": "2026-05-21T13:16:19.410",
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
        {
          "lang": "en",
          "value": "CWE-131"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: rpl: reserve mac_len headroom when recompressed SRH grows\n\nipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps\nthe next segment into ipv6_hdr->daddr, recompresses, then pulls the old\nheader and pushes the new one plus the IPv6 header back.  The\nrecompressed header can be larger than the received one when the swap\nreduces the common-prefix length the segments share with daddr (CmprI=0,\nCmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes).\n\npskb_expand_head() was gated on segments_left == 0, so on earlier\nsegments the push consumed unchecked headroom.  Once skb_push() leaves\nfewer than skb->mac_len bytes in front of data,\nskb_mac_header_rebuild()'s call to:\n\n\tskb_set_mac_header(skb, -skb->mac_len);\n\nwill store (data - head) - mac_len into the u16 mac_header field, which\nwraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB\npast skb->head.\n\nA single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two\nsegment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one\npass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv.\n\nFix this by expanding the head whenever the remaining room is less than\nthe push size plus mac_len, and request that much extra so the rebuilt\nMAC header fits afterwards."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipv6: rpl: reservar espacio libre (headroom) para mac_len cuando el SRH recomprimido crece\n\nipv6_rpl_srh_rcv() descomprime un encabezado de enrutamiento de origen (Source Routing Header) RFC 6554, intercambia el siguiente segmento en ipv6_hdr->daddr, recomprime, luego extrae el encabezado antiguo y empuja el nuevo más el encabezado IPv6 de vuelta. El encabezado recomprimido puede ser más grande que el recibido cuando el intercambio reduce la longitud del prefijo común que los segmentos comparten con daddr (CmprI=0, CmprE>0, seg[0][0] != daddr[0] da un máximo de +8 bytes).\n\npskb_expand_head() estaba condicionado a segments_left == 0, así que en segmentos anteriores el empuje consumió espacio libre (headroom) sin verificar. Una vez que skb_push() deja menos de skb->mac_len bytes delante de los datos, la llamada de skb_mac_header_rebuild() a:\n\n\tskb_set_mac_header(skb, -skb->mac_len);\n\nalmacenará (data - head) - mac_len en el campo u16 mac_header, que se ajusta a ~65530, y el siguiente memmove() escribe mac_len bytes ~64KiB más allá de skb->head.\n\nUn único paquete AF_INET6/SOCK_RAW/IPV6_HDRINCL sobre lo con un SRH tipo 3 de dos segmentos (CmprI=0, CmprE=15) alcanza un espacio libre (headroom) de 8 después de una pasada; KASAN informa de una escritura OOB de 14 bytes en ipv6_rthdr_rcv.\n\nSolucione esto expandiendo el encabezado siempre que el espacio restante sea menor que el tamaño del empuje más mac_len, y solicite esa cantidad extra para que el encabezado MAC reconstruido quepa después."
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  "lastModified": "2026-09-08T09:18:05.747",
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