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CVE-2026-97598

Estado: RecibidaSin puntuar—

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

ipv4: fib: bound automatic table ID allocation

fib_empty_table() probes every table ID from 1 until it finds a free one. IPv4 tables are stored in a 256-bucket hash table, so a dense set of IDs makes each probe walk a growing hash chain while RTNL is held.

Automatic table assignment ("ip rule ... table 0") is an IPv4-only legacy path. Bound the automatically allocated ID to 4096 so the RTNL hold stays bounded, without changing lookups of explicitly specified table IDs.

This changes user-visible behavior. A table-0 rule previously received the lowest free ID in 1..RT_TABLE_MAX (0xFFFFFFFF).

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After this patch the search stops at 4096 and the rule add fails with ENOBUFS if that range is fully occupied. Explicit table IDs above 4096 remain usable.

The automatic path is unused in practice: it is IPv4-only, not documented by ip-rule, uncovered by kernel selftests, and both NetworkManager and systemd refuse table 0.

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-2026-97598",
  "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": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
              "lessThan": "999bc00588cb305ab25065e8a8ac31da7465301c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
              "lessThan": "f1f2da33eaab54b4d5cdea6d70befb2e2fb49cb6",
              "versionType": "git"
            },
            {
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              "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
              "lessThan": "125890702ef4417cd0ffac2e448c0cd4fbf0ac45",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
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              "versionType": "git"
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            {
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              "versionType": "git"
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            {
              "status": "affected",
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              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/ipv4/fib_rules.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": "5.10.271",
              "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/ipv4/fib_rules.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:11.130",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/125890702ef4417cd0ffac2e448c0cd4fbf0ac45",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2c29c053a6627dc4f12fcfe6b4860bcd9e5d7503",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3080f9e653d8c057d5652db5ced8137f81b3fcbd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/999bc00588cb305ab25065e8a8ac31da7465301c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bc8d01d856db106f284b19961af6112e10c3e3b4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/efdfb1e27a3328085b79540dfe781d537b576ea1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f1f2da33eaab54b4d5cdea6d70befb2e2fb49cb6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fe9a906d2bff2d2707bafd6353b5e032a42aeb35",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: fib: bound automatic table ID allocation\n\nfib_empty_table() probes every table ID from 1 until it finds a\nfree one.  IPv4 tables are stored in a 256-bucket hash table, so a\ndense set of IDs makes each probe walk a growing hash chain while\nRTNL is held.\n\nAutomatic table assignment (\"ip rule ... table 0\") is an IPv4-only\nlegacy path.  Bound the automatically allocated ID to 4096 so the\nRTNL hold stays bounded, without changing lookups of explicitly\nspecified table IDs.\n\nThis changes user-visible behavior.  A table-0 rule previously\nreceived the lowest free ID in 1..RT_TABLE_MAX (0xFFFFFFFF).  After\nthis patch the search stops at 4096 and the rule add fails with\nENOBUFS if that range is fully occupied.  Explicit table IDs above\n4096 remain usable.\n\nThe automatic path is unused in practice: it is IPv4-only, not\ndocumented by ip-rule, uncovered by kernel selftests, and both\nNetworkManager and systemd refuse table 0."
    }
  ],
  "lastModified": "2026-10-03T11:18:06.343",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}