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CVE-2026-64575

Estado: RecibidaAlta (7.8)—

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

bpf: tcp: fix double sock release on batch realloc

bpf_iter_tcp_batch() releases the current batch via bpf_iter_tcp_put_batch(), which drops the socket refs and rewrites each slot with the socket cookie, then grows the batch. cur_sk/end_sk are kept for bpf_iter_tcp_resume(), but on realloc failure the function returns ERR_PTR() before resume runs, leaving cur_sk < end_sk over slots that now hold cookies rather than sock pointers. bpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and dereferences a cookie as a struct sock.

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Empty the batch on the failure path so stop() does not release it again. The sockets were already freed by the first bpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans the bucket from the start instead of skipping it. The sibling GFP_NOWAIT failure path still holds real socket references and is left for stop() to release.

Detalles técnicos trazas, registros y código del informe original
  BUG: KASAN: null-ptr-deref in __sock_gen_cookie
  Read of size 8 at addr 0000000000000059 by task exploit
   ...
   __sock_gen_cookie (net/core/sock_diag.c:28)
   bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)
   bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)
   bpf_seq_read (kernel/bpf/bpf_iter.c:205)
   vfs_read (fs/read_write.c:572)
   ksys_read (fs/read_write.c:716)
   do_syscall_64
   entry_SYSCALL_64_after_hwframe
  Kernel panic - not syncing: Fatal exception

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.

Vulnerabilidad local (AV:L, PR:L) que causa null-ptr-deref y kernel panic tras doble liberación de sockets en iterador BPF; escalada de privilegios mediante crash controlado 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 ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

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-2026-64575",
  "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": "9794ac757a650dd594391192183c9caf939f8223",
              "lessThan": "c842882e4c5d2818b858d6baf3fd10958c93f729",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4",
              "lessThan": "7a6a6d2a127866935f87b55b557bc89693065462",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "36f955807ee4ede07e9410772f792e4cb4ec807b",
              "lessThan": "f0c1810320b0dac228103fad7311e89532134d83",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
              "lessThan": "9f27c4f0ae35b5390ce4f7a54d3501144e41a54d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
              "lessThan": "8a726e9585ffe7bfbfad2b5279277a00973970f3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
              "lessThan": "980a813452754f8001704744e92f7aa697c53dd3",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/ipv4/tcp_ipv4.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv4/tcp_ipv4.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-05T08:16:37.363",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c842882e4c5d2818b858d6baf3fd10958c93f729",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: tcp: fix double sock release on batch realloc\n\nbpf_iter_tcp_batch() releases the current batch via\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites\neach slot with the socket cookie, then grows the batch. cur_sk/end_sk\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over\nslots that now hold cookies rather than sock pointers.\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and\ndereferences a cookie as a struct sock.\n\nEmpty the batch on the failure path so stop() does not release it\nagain. The sockets were already freed by the first\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans\nthe bucket from the start instead of skipping it. The sibling\nGFP_NOWAIT failure path still holds real socket references and is left\nfor stop() to release.\n\n  BUG: KASAN: null-ptr-deref in __sock_gen_cookie\n  Read of size 8 at addr 0000000000000059 by task exploit\n   ...\n   __sock_gen_cookie (net/core/sock_diag.c:28)\n   bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918)\n   bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270)\n   bpf_seq_read (kernel/bpf/bpf_iter.c:205)\n   vfs_read (fs/read_write.c:572)\n   ksys_read (fs/read_write.c:716)\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n  Kernel panic - not syncing: Fatal exception"
    }
  ],
  "lastModified": "2026-08-19T17:20:17.387",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}