{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74657",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.923Z",
        "datePublished": "2026-08-22T15:32:31.458Z",
        "dateUpdated": "2026-08-22T15:32:31.458Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-22T15:32:31.458Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops\n\nfib_nlmsg_size() still estimates nexthop space as if every gateway is\nencoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an\nIPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA.\n\nAs a result, route notifications can allocate an skb that is too small.\nfib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the\nWARN_ON() that marks such failures as a fib_nlmsg_size() bug. With\npanic_on_warn set, this becomes a kernel panic.\n\nMirror the actual nexthop dump layout in fib_nlmsg_size(): account for\nIPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop\nlayout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is\nactually present."
                }
            ],
            "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": "d15662682db232da77136cd348f4c9df312ca6f9",
                            "lessThan": "0f0ca602941d0a81ae9514943ca06c55159c6385",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d15662682db232da77136cd348f4c9df312ca6f9",
                            "lessThan": "5307a53599fa762c06e475ee4a375252074fd324",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d15662682db232da77136cd348f4c9df312ca6f9",
                            "lessThan": "7f80ad373ce4a7af5367ff273cea0f16e91387f3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d15662682db232da77136cd348f4c9df312ca6f9",
                            "lessThan": "4a5dfbae5179f6574695012a980476254df2d295",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d15662682db232da77136cd348f4c9df312ca6f9",
                            "lessThan": "a59edda6eda1252340354322d8ab318b2e9052fb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d15662682db232da77136cd348f4c9df312ca6f9",
                            "lessThan": "9b22f13524fa0de0d963bbd3002df6c28bae3395",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d15662682db232da77136cd348f4c9df312ca6f9",
                            "lessThan": "4ff9548d84945d2cbf9e4c207288063a200ea397",
                            "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": "5.2",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.216",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.183",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.152",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.104",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.45",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.9",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionEndExcluding": "7.1.9"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/0f0ca602941d0a81ae9514943ca06c55159c6385"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5307a53599fa762c06e475ee4a375252074fd324"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7f80ad373ce4a7af5367ff273cea0f16e91387f3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4a5dfbae5179f6574695012a980476254df2d295"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a59edda6eda1252340354322d8ab318b2e9052fb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9b22f13524fa0de0d963bbd3002df6c28bae3395"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4ff9548d84945d2cbf9e4c207288063a200ea397"
                }
            ],
            "title": "ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops",
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