« Volver al listado

CVE-2026-63922

Estado: Pendiente de análisisCrítica (9.8)—

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

ipv6: exthdrs: refresh nh after handling HAO option

ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs.

ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs are parsed from the current skb head.

This matches the existing pattern used in ip6_parse_tlv() after helpers that can modify skb header storage.

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 AV:N/AC:L/PR:N/UI:N indica red sin autenticación (T1190). La invalidación de punteros en memoria tras pskb_expand_head() puede causar DoS (lectura OOB, crash) o corrupción de datos de paquetes IPv6.

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

Filter Network TrafficVulnerability ScanningRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data StorageNetwork Segmentation

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-63922",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "b3ac54e5c905f86d22b502eacb5686a282c5659f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "f8aabed3ff3e986920cf02a2a2785e08e586b234",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "12d957979e4a800167842f1b42be6a606d227ebe",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "ff375ed1cba81392346c5bfbf0bb7a13b2946f99",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "751db1b802a067b7fff25880f4e9f9152a171538",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "9b6dcc0a39fd71752937f0b6b3973e1416085dcf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a831f5bbc89a9978795504be9e1ff412043f8f77",
              "lessThan": "f7b52afe3592eae66e160586b45a3f2242972c63",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/ipv6/exthdrs.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv6/exthdrs.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-19T16:17:10.440",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/12d957979e4a800167842f1b42be6a606d227ebe",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/751db1b802a067b7fff25880f4e9f9152a171538",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9b6dcc0a39fd71752937f0b6b3973e1416085dcf",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b3ac54e5c905f86d22b502eacb5686a282c5659f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f7b52afe3592eae66e160586b45a3f2242972c63",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f8aabed3ff3e986920cf02a2a2785e08e586b234",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ff375ed1cba81392346c5bfbf0bb7a13b2946f99",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: exthdrs: refresh nh after handling HAO option\n\nip6_parse_tlv() caches skb_network_header(skb) in nh while walking\nIPv6 TLVs.\n\nipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can\nmove the skb head and invalidate the cached network header pointer.\nRefresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs\nare parsed from the current skb head.\n\nThis matches the existing pattern used in ip6_parse_tlv() after helpers\nthat can modify skb header storage."
    }
  ],
  "lastModified": "2026-07-28T14:16:39.443",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}