{"api_version":"1","generated_at":"2026-08-22T18:31:25+00:00","cve":"CVE-2026-74598","urls":{"html":"https://cve.report/CVE-2026-74598","api":"https://cve.report/api/cve/CVE-2026-74598.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74598","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74598"},"summary":{"title":"ipv6: fix Route Information option length validation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix Route Information option length validation\n\nrt6_route_rcv() validates the Route Information option (RFC 4191) length\nagainst the prefix length, but both checks are off by one.\n\nrinfo->length is the ND option length in units of 8 octets and it\n*includes* the 8-byte option header, so an option carrying N bytes of\nprefix has length == 1 + N/8.  RFC 4191 section 2.3 requires length 3\nwhen Prefix Length is greater than 64, and 2 or 3 when it is greater\nthan 0.  The code accepts length >= 2 and length >= 1 respectively.\n\nipv6_addr_prefix() then copies prefix_len/8 bytes out of rinfo->prefix,\nso a Router Advertisement with (prefix_len=128, length=2) or\n(prefix_len=64, length=1) makes the kernel read up to 8 bytes past the\nend of the option.  Those bytes end up in the prefix of the route that\ngets installed, so they are visible to userspace:\n\n  # RA with a Route Information option (prefix_len=128, length=2)\n  # followed by a source link-layer address option, 01 01 de ad be ef ca fe\n  $ ip -6 route show\n  2001:db8:dead:beef:101:dead:beef:cafe via fe80::1234 dev veth0 proto ra\n                     ^^^^^^^^^^^^^^^^^^ the next option, read out of bounds\n\nWhen the Route Information option is the last one in the packet, those\neight bytes come from the skb tail room instead.\n\nReject the option lengths RFC 4191 does not allow.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:32","updated_at":"2026-08-22 16:16:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d","name":"https://git.kernel.org/stable/c/0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7309529f257ae18e72112ef9f614edfd6df229bb","name":"https://git.kernel.org/stable/c/7309529f257ae18e72112ef9f614edfd6df229bb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/da64ed1f346ba84df574d6469fa2e422b2511719","name":"https://git.kernel.org/stable/c/da64ed1f346ba84df574d6469fa2e422b2511719","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ff3cb05289b8a4ef95fa7ea14c7d34818359edbb","name":"https://git.kernel.org/stable/c/ff3cb05289b8a4ef95fa7ea14c7d34818359edbb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d1ad8fb2ac6a1afb71dc22d9ae8efb4dda96c824","name":"https://git.kernel.org/stable/c/d1ad8fb2ac6a1afb71dc22d9ae8efb4dda96c824","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7eac87396c44a312be457ef41d4c5687883be9a2","name":"https://git.kernel.org/stable/c/7eac87396c44a312be457ef41d4c5687883be9a2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3b2231e358d26e3aec5d8040b1fb777af03c5f05","name":"https://git.kernel.org/stable/c/3b2231e358d26e3aec5d8040b1fb777af03c5f05","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2f6f94eda12430fb41b24b44a71e2ea4e93561d7","name":"https://git.kernel.org/stable/c/2f6f94eda12430fb41b24b44a71e2ea4e93561d7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74598","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74598","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 70ceb4f53929f73746be72f73707cd9f8753e2fc 2f6f94eda12430fb41b24b44a71e2ea4e93561d7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 70ceb4f53929f73746be72f73707cd9f8753e2fc 7eac87396c44a312be457ef41d4c5687883be9a2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 70ceb4f53929f73746be72f73707cd9f8753e2fc 7309529f257ae18e72112ef9f614edfd6df229bb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 70ceb4f53929f73746be72f73707cd9f8753e2fc 0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/route.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2f6f94eda12430fb41b24b44a71e2ea4e93561d7","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"},{"lessThan":"7eac87396c44a312be457ef41d4c5687883be9a2","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"},{"lessThan":"7309529f257ae18e72112ef9f614edfd6df229bb","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"},{"lessThan":"0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"},{"lessThan":"ff3cb05289b8a4ef95fa7ea14c7d34818359edbb","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"},{"lessThan":"3b2231e358d26e3aec5d8040b1fb777af03c5f05","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"},{"lessThan":"da64ed1f346ba84df574d6469fa2e422b2511719","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"},{"lessThan":"d1ad8fb2ac6a1afb71dc22d9ae8efb4dda96c824","status":"affected","version":"70ceb4f53929f73746be72f73707cd9f8753e2fc","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/route.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.17"},{"lessThan":"2.6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.265","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.216","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.265","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.216","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"2.6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix Route Information option length validation\n\nrt6_route_rcv() validates the Route Information option (RFC 4191) length\nagainst the prefix length, but both checks are off by one.\n\nrinfo->length is the ND option length in units of 8 octets and it\n*includes* the 8-byte option header, so an option carrying N bytes of\nprefix has length == 1 + N/8.  RFC 4191 section 2.3 requires length 3\nwhen Prefix Length is greater than 64, and 2 or 3 when it is greater\nthan 0.  The code accepts length >= 2 and length >= 1 respectively.\n\nipv6_addr_prefix() then copies prefix_len/8 bytes out of rinfo->prefix,\nso a Router Advertisement with (prefix_len=128, length=2) or\n(prefix_len=64, length=1) makes the kernel read up to 8 bytes past the\nend of the option.  Those bytes end up in the prefix of the route that\ngets installed, so they are visible to userspace:\n\n  # RA with a Route Information option (prefix_len=128, length=2)\n  # followed by a source link-layer address option, 01 01 de ad be ef ca fe\n  $ ip -6 route show\n  2001:db8:dead:beef:101:dead:beef:cafe via fe80::1234 dev veth0 proto ra\n                     ^^^^^^^^^^^^^^^^^^ the next option, read out of bounds\n\nWhen the Route Information option is the last one in the packet, those\neight bytes come from the skb tail room instead.\n\nReject the option lengths RFC 4191 does not allow."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:31:47.859Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2f6f94eda12430fb41b24b44a71e2ea4e93561d7"},{"url":"https://git.kernel.org/stable/c/7eac87396c44a312be457ef41d4c5687883be9a2"},{"url":"https://git.kernel.org/stable/c/7309529f257ae18e72112ef9f614edfd6df229bb"},{"url":"https://git.kernel.org/stable/c/0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d"},{"url":"https://git.kernel.org/stable/c/ff3cb05289b8a4ef95fa7ea14c7d34818359edbb"},{"url":"https://git.kernel.org/stable/c/3b2231e358d26e3aec5d8040b1fb777af03c5f05"},{"url":"https://git.kernel.org/stable/c/da64ed1f346ba84df574d6469fa2e422b2511719"},{"url":"https://git.kernel.org/stable/c/d1ad8fb2ac6a1afb71dc22d9ae8efb4dda96c824"}],"title":"ipv6: fix Route Information option length validation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74598","datePublished":"2026-08-22T15:31:47.859Z","dateReserved":"2026-08-15T05:44:03.919Z","dateUpdated":"2026-08-22T15:31:47.859Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:32","lastModifiedDate":"2026-08-22 16:16:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74598","Ordinal":"1","Title":"ipv6: fix Route Information option length validation","CVE":"CVE-2026-74598","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74598","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix Route Information option length validation\n\nrt6_route_rcv() validates the Route Information option (RFC 4191) length\nagainst the prefix length, but both checks are off by one.\n\nrinfo->length is the ND option length in units of 8 octets and it\n*includes* the 8-byte option header, so an option carrying N bytes of\nprefix has length == 1 + N/8.  RFC 4191 section 2.3 requires length 3\nwhen Prefix Length is greater than 64, and 2 or 3 when it is greater\nthan 0.  The code accepts length >= 2 and length >= 1 respectively.\n\nipv6_addr_prefix() then copies prefix_len/8 bytes out of rinfo->prefix,\nso a Router Advertisement with (prefix_len=128, length=2) or\n(prefix_len=64, length=1) makes the kernel read up to 8 bytes past the\nend of the option.  Those bytes end up in the prefix of the route that\ngets installed, so they are visible to userspace:\n\n  # RA with a Route Information option (prefix_len=128, length=2)\n  # followed by a source link-layer address option, 01 01 de ad be ef ca fe\n  $ ip -6 route show\n  2001:db8:dead:beef:101:dead:beef:cafe via fe80::1234 dev veth0 proto ra\n                     ^^^^^^^^^^^^^^^^^^ the next option, read out of bounds\n\nWhen the Route Information option is the last one in the packet, those\neight bytes come from the skb tail room instead.\n\nReject the option lengths RFC 4191 does not allow.","Type":"Description","Title":"ipv6: fix Route Information option length validation"}]}}}