{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-99072",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.389Z",
        "datePublished": "2026-10-23T12:23:15.735Z",
        "dateUpdated": "2026-10-30T12:41:31.995Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-30T12:41:31.995Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: stop route notification sizing when nexthop group shrinks\n\nCommit 680aea08e78c (\"net: ipv4: Emit notification when fib\nhardware flags are changed\") added an RCU-only fib_nlmsg_size() call\nfor asynchronous hardware flag notifications.\n\nfib_nlmsg_size() checks fib_info_num_path() before each iteration,\nthen fib_info_nhc() independently reloads nh->nh_grp. If\nRTM_NEWNEXTHOP replaces a group with fewer paths between those loads,\nfib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences\nit.\n\nStop sizing when the indexed path is absent. Nexthop groups are\ndense, so the current snapshot has no later path."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/fib_semantics.c"
                    ],
                    "versions": [
                        {
                            "version": "680aea08e78c003292415518ad270bc20f9c80b1",
                            "lessThan": "96f3fbb8575593657c7e80786dc3251d2fe3931b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "680aea08e78c003292415518ad270bc20f9c80b1",
                            "lessThan": "81f0deb02a5b5477f236bbbaed1149b779a8632b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "680aea08e78c003292415518ad270bc20f9c80b1",
                            "lessThan": "72d9d17092bb37b0717f12042a0817d01a1f9e78",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "680aea08e78c003292415518ad270bc20f9c80b1",
                            "lessThan": "ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "680aea08e78c003292415518ad270bc20f9c80b1",
                            "lessThan": "c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "680aea08e78c003292415518ad270bc20f9c80b1",
                            "lessThan": "ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "680aea08e78c003292415518ad270bc20f9c80b1",
                            "lessThan": "d3daa33c7af92e38f2274bbd2576f58bfbaf89e6",
                            "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_semantics.c"
                    ],
                    "versions": [
                        {
                            "version": "5.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.224",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.191",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.113",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.57",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.11",
                            "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": "5.12",
                                    "versionEndExcluding": "5.15.224"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.1.191"
                                },
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                                },
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                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.18.57"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "7.2.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "7.3"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/96f3fbb8575593657c7e80786dc3251d2fe3931b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/81f0deb02a5b5477f236bbbaed1149b779a8632b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/72d9d17092bb37b0717f12042a0817d01a1f9e78"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d3daa33c7af92e38f2274bbd2576f58bfbaf89e6"
                }
            ],
            "title": "ipv4: stop route notification sizing when nexthop group shrinks",
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                "engine": "bippy-1.2.0"
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}