FKIE_CVE-2026-74624

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: defer invalid log until after unlock TCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock is still held. When invalid logging is routed to nfnetlink_log and conntrack export is enabled, the log path can re-enter conntrack netlink glue and dump the same conntrack again. Protocol attribute dumping may take ct->lock, so logging while holding that lock can deadlock. Defer the TCP invalid logs by storing only the minimal log context while ct->lock is held and emitting the log after unlocking. Also make the TCP timeout-lowering invalid path return whether a log is needed, then emit that log after unlocking. Do the same for the SCTP invalid state-transition log that can be reached while ct->lock is held. Add a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers that log invalid conntracks while holding ct->lock are caught outside TCP and SCTP as well.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0424186d570aa4d1ad17f516afb86bd9eaa4f42e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d19b95c9723001f214f7a47d67b09f46238f200
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/63853eb20bba4e00b7cd0b8cfc19337bbaaf5037
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9480fcf70a5aa9d320088a01c95df0e5e6391f4a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c0224327b7cbed9d3198e8dbec847281053dcd06
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca97360eba4b3dc67f1804625542f4ccc774242a
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_proto.c",
            "net/netfilter/nf_conntrack_proto_sctp.c",
            "net/netfilter/nf_conntrack_proto_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ca97360eba4b3dc67f1804625542f4ccc774242a",
              "status": "affected",
              "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
              "versionType": "git"
            },
            {
              "lessThan": "63853eb20bba4e00b7cd0b8cfc19337bbaaf5037",
              "status": "affected",
              "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
              "versionType": "git"
            },
            {
              "lessThan": "9480fcf70a5aa9d320088a01c95df0e5e6391f4a",
              "status": "affected",
              "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
              "versionType": "git"
            },
            {
              "lessThan": "0424186d570aa4d1ad17f516afb86bd9eaa4f42e",
              "status": "affected",
              "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
              "versionType": "git"
            },
            {
              "lessThan": "c0224327b7cbed9d3198e8dbec847281053dcd06",
              "status": "affected",
              "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
              "versionType": "git"
            },
            {
              "lessThan": "2d19b95c9723001f214f7a47d67b09f46238f200",
              "status": "affected",
              "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_proto.c",
            "net/netfilter/nf_conntrack_proto_sctp.c",
            "net/netfilter/nf_conntrack_proto_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "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\nnetfilter: nf_conntrack: defer invalid log until after unlock\n\nTCP and SCTP conntrack paths can emit invalid-packet logs while ct-\u003elock\nis still held.\n\nWhen invalid logging is routed to nfnetlink_log and conntrack export is\nenabled, the log path can re-enter conntrack netlink glue and dump the\nsame conntrack again. Protocol attribute dumping may take ct-\u003elock, so\nlogging while holding that lock can deadlock.\n\nDefer the TCP invalid logs by storing only the minimal log context while\nct-\u003elock is held and emitting the log after unlocking. Also make the TCP\ntimeout-lowering invalid path return whether a log is needed, then emit\nthat log after unlocking.\n\nDo the same for the SCTP invalid state-transition log that can be reached\nwhile ct-\u003elock is held.\n\nAdd a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers\nthat log invalid conntracks while holding ct-\u003elock are caught outside TCP\nand SCTP as well."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_conntrack: aplazar el registro inv\u00e1lido hasta despu\u00e9s del desbloqueo\n\nLas rutas de conntrack de TCP y SCTP pueden emitir registros de paquetes inv\u00e1lidos mientras ct -\u003e lock a\u00fan est\u00e1 retenido.\n\nCuando el registro inv\u00e1lido se enruta a nfnetlink_log y la exportaci\u00f3n de conntrack est\u00e1 habilitada, la ruta de registro puede volver a entrar en el pegamento netlink de conntrack y volcar el mismo conntrack de nuevo. El volcado de atributos del protocolo puede tomar ct -\u003e lock, por lo que registrar mientras se retiene ese bloqueo puede causar un interbloqueo.\n\nAplazar los registros inv\u00e1lidos de TCP almacenando solo el contexto m\u00ednimo del registro mientras ct -\u003e lock est\u00e1 retenido y emitiendo el registro despu\u00e9s del desbloqueo. Tambi\u00e9n hacer que la ruta inv\u00e1lida de reducci\u00f3n de tiempo de espera de TCP devuelva si se necesita un registro, luego emitir ese registro despu\u00e9s del desbloqueo.\n\nHacer lo mismo para el registro de transici\u00f3n de estado inv\u00e1lido de SCTP al que se puede llegar mientras ct -\u003e lock est\u00e1 retenido.\n\nA\u00f1adir una aserci\u00f3n lockdep a nf_ct_l4proto_log_invalid() para que futuros llamadores que registren conntracks inv\u00e1lidos mientras retienen ct -\u003e lock sean detectados tambi\u00e9n fuera de TCP y SCTP."
    }
  ],
  "id": "CVE-2026-74624",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:35.280",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0424186d570aa4d1ad17f516afb86bd9eaa4f42e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2d19b95c9723001f214f7a47d67b09f46238f200"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/63853eb20bba4e00b7cd0b8cfc19337bbaaf5037"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9480fcf70a5aa9d320088a01c95df0e5e6391f4a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c0224327b7cbed9d3198e8dbec847281053dcd06"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca97360eba4b3dc67f1804625542f4ccc774242a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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