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CVE-2026-97472

Estado: RecibidaSin puntuar—

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

ipv6: addrconf: fix temp address generation after prefix deprecation

When a router temporarily deprecates an IPv6 prefix (either by sending a Router Advertisement with Preferred Lifetime = 0 or by letting the lifetime expire) and later restores it, the kernel permanently loses its ability to generate temporary privacy addresses (RFC 8981) for that prefix.

This happens because the address worker attempts to generate a replacement temporary address when the current one nears expiration. As the base prefix is deprecated already, the generation fails after marking the temporary address as already having spawned a replacement (ifp->regen_count++).

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When the router eventually restores the prefix, the temporary address becomes active again. However, once it naturally expires, the address worker sees this temporary address already tried to generate one and skips the regeneration.

Fix the issue by resetting the regen_count check of the latest temp address generated for the prefix updated by the incoming RA.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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).

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)

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{
  "id": "CVE-2026-97472",
  "cveTags": [],
  "metrics": {},
  "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": "76f793e3a47139d340185cbc1a314740c09b13d3",
              "lessThan": "b00f7c1da82a809156f785ed37536c2d2584927d",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "6da8ba900b85e6478e211427630c67595fb707a4",
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            {
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              "versionType": "git"
            },
            {
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            }
          ],
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-24T17:17:24.273",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4df5597c65446135362f72880995e8920f058fa0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f7d2a8dc364c4e55d0a1533451339008512933f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6da8ba900b85e6478e211427630c67595fb707a4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b00f7c1da82a809156f785ed37536c2d2584927d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bff7b87dfa28a1502c18d0c6f1fadda5162fa854",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e20d8922aa8fe441d291364c96c2179a005b79ea",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f601ec5c92b3260c742f27a5d2fd289e30ae798f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: fix temp address generation after prefix deprecation\n\nWhen a router temporarily deprecates an IPv6 prefix (either by sending a\nRouter Advertisement with Preferred Lifetime = 0 or by letting the\nlifetime expire) and later restores it, the kernel permanently loses its\nability to generate temporary privacy addresses (RFC 8981) for that\nprefix.\n\nThis happens because the address worker attempts to generate a\nreplacement temporary address when the current one nears expiration. As\nthe base prefix is deprecated already, the generation fails after\nmarking the temporary address as already having spawned a replacement\n(ifp->regen_count++).\n\nWhen the router eventually restores the prefix, the temporary address\nbecomes active again. However, once it naturally expires, the address\nworker sees this temporary address already tried to generate one and\nskips the regeneration.\n\nFix the issue by resetting the regen_count check of the latest temp\naddress generated for the prefix updated by the incoming RA."
    }
  ],
  "lastModified": "2026-10-03T11:17:57.617",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}