{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-97598",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-24T16:01:01.157Z",
        "datePublished": "2026-09-25T10:22:12.972Z",
        "dateUpdated": "2026-10-19T09:10:02.029Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:10:02.029Z"
            },
            "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."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/fib_rules.c"
                    ],
                    "versions": [
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "999bc00588cb305ab25065e8a8ac31da7465301c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "f1f2da33eaab54b4d5cdea6d70befb2e2fb49cb6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "125890702ef4417cd0ffac2e448c0cd4fbf0ac45",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "3080f9e653d8c057d5652db5ced8137f81b3fcbd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "bc8d01d856db106f284b19961af6112e10c3e3b4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "fe9a906d2bff2d2707bafd6353b5e032a42aeb35",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "2c29c053a6627dc4f12fcfe6b4860bcd9e5d7503",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b801f54917b7c6e8540f877ee562cd0725e62ebd",
                            "lessThan": "efdfb1e27a3328085b79540dfe781d537b576ea1",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/fib_rules.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "5.10.271"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "5.15.222"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "6.1.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "6.12.111"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "7.2.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.19",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/999bc00588cb305ab25065e8a8ac31da7465301c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f1f2da33eaab54b4d5cdea6d70befb2e2fb49cb6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/125890702ef4417cd0ffac2e448c0cd4fbf0ac45"
                },
                {
                    "url": "https://git.kernel.org/stable/c/3080f9e653d8c057d5652db5ced8137f81b3fcbd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bc8d01d856db106f284b19961af6112e10c3e3b4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/fe9a906d2bff2d2707bafd6353b5e032a42aeb35"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2c29c053a6627dc4f12fcfe6b4860bcd9e5d7503"
                },
                {
                    "url": "https://git.kernel.org/stable/c/efdfb1e27a3328085b79540dfe781d537b576ea1"
                }
            ],
            "title": "ipv4: fib: bound automatic table ID allocation",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}