« Volver al listado

CVE-2026-97940

Estado: RecibidaAlta (7.8)—

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

ipv6: fix fib6 walker UAF on seq stop

ipv6_route_iter_active() treats a walker in FWS_U at the table root as already unlinked. fib6_del_route() can move a still-linked walker into that same state when the current leaf is the last route at the root, so ipv6_route_native_seq_stop() skips fib6_walker_unlink(). The seq private object can then be freed while it remains on net->ipv6.fib6_walkers. A later route deletion walks the dangling list and uses the freed walker.

Use the list head as membership state and reinitialize it when unlinking. Keep the existing w->node check so a never-started iterator with a zeroed private object is not treated as linked.

Leer descripción completaMostrar menos

The same stop helper is used by /proc/net/ipv6_route and by the BPF ipv6_route iterator. The BPF show path only widens the race.

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.

UAF en kernel Linux explotable con privs locales (PR:L) permite DoS o escalada; pista sugiere T1068 por acceso local a memoria del 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

Threat Intelligence ProgramPassword PoliciesMulti-factor AuthenticationFilter Network TrafficExecution PreventionApplication Isolation and Sandboxing

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-2026-97940",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "9a3f73d62c86271614eda4c43315230896a37018",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "63407cddabc5992b5ac03af165559f4a1968a032",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "05b687ee04f816658f4a9cf586f4d2f129157943",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "14fdaba201fdff92a3e45994e02bccda409cb19d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "0eede1689610e9eeaf729ba86fd1321799eb91a0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "b89b691dd00bf39b9ba39ab9446f8c62f419fa7b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
              "lessThan": "19b4ed644d68098cc62ab612727f40d30f43476c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/ipv6/ip6_fib.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.13",
              "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": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv6/ip6_fib.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:21.410",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/05b687ee04f816658f4a9cf586f4d2f129157943",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0eede1689610e9eeaf729ba86fd1321799eb91a0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/14fdaba201fdff92a3e45994e02bccda409cb19d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/19b4ed644d68098cc62ab612727f40d30f43476c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/63407cddabc5992b5ac03af165559f4a1968a032",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9a3f73d62c86271614eda4c43315230896a37018",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b89b691dd00bf39b9ba39ab9446f8c62f419fa7b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix fib6 walker UAF on seq stop\n\nipv6_route_iter_active() treats a walker in FWS_U at the table root as\nalready unlinked. fib6_del_route() can move a still-linked walker into\nthat same state when the current leaf is the last route at the root,\nso ipv6_route_native_seq_stop() skips fib6_walker_unlink(). The seq\nprivate object can then be freed while it remains on\nnet->ipv6.fib6_walkers. A later route deletion walks the dangling list\nand uses the freed walker.\n\nUse the list head as membership state and reinitialize it when\nunlinking. Keep the existing w->node check so a never-started iterator\nwith a zeroed private object is not treated as linked.\n\nThe same stop helper is used by /proc/net/ipv6_route and by the BPF\nipv6_route iterator. The BPF show path only widens the race."
    }
  ],
  "lastModified": "2026-10-03T11:18:19.610",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}