FKIE_CVE-2026-74597

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip6ip6_err() ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the quoted inner IPv6 packet, and then passes the clone to icmpv6_send(). The clone still carries the outer packet's inet6_skb_parm in skb->cb. If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao remains non-zero after skb_pull(). icmpv6_send() later calls mip6_addr_swap(), which uses that stale dsthao offset against the quoted inner packet. A malformed inner destination-options header can then make the HAO lookup and address swap run past the end of the quoted packet and corrupt skb_shared_info. Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the reply path does not reuse metadata left by the outer IPv6 stack.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "44fe898df302e91c5ee5acbc71ffa74e78e6c183",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "0dadb0620ab65949a8bc2439dd28ea3c942fe87d",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "b6816536a2990c0db44a26130a03e40b441e829b",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "64e41736a26f37ab6215bc2e6df125df05aceb08",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "484134e1eb07d700a73b1e4bbf3fb503e299be60",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "4eb15c465337b18f44716c499cd6ad63eee0ad54",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "fbf40faa0414b753212494ad197542002e66ed9e",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "f803c086399da277b5d0ff36a107d0f162751800",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet\u0027s inet6_skb_parm in skb-\u003ecb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)-\u003edsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2-\u003ecb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nip6_tunnel: limpiar skb2 -\u003e cb[] en ip6ip6_err()\n\nip6ip6_err() clona un skb de error ICMP IPv6 externo, lo extrae al paquete IPv6 interno citado y luego pasa el clon a icmpv6_send(). El clon todav\u00eda lleva el inet6_skb_parm del paquete externo en skb -\u003e cb.\n\nSi el paquete externo ten\u00eda una Opci\u00f3n de Direcci\u00f3n de Origen (Home Address Option), IP6CB(skb2) -\u003e dsthao permanece distinto de cero despu\u00e9s de skb_pull(). icmpv6_send() m\u00e1s tarde llama a mip6_addr_swap(), que utiliza ese desplazamiento dsthao obsoleto contra el paquete interno citado. Un encabezado de opciones de destino interno malformado puede entonces hacer que la b\u00fasqueda HAO y el intercambio de direcciones se ejecuten m\u00e1s all\u00e1 del final del paquete citado y corrompan skb_shared_info.\n\nLimpiar skb2 -\u003e cb[] antes de extraer el paquete IPv6 interno citado para que la ruta de respuesta no reutilice los metadatos dejados por la pila IPv6 externa."
    }
  ],
  "id": "CVE-2026-74597",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:32.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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