{"id":"CVE-2026-74597","revision":null,"records":[{"revision":"11948ff04c784663bcd817bdca0c64aa","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74597","aliases":[],"title":"ip6_tunnel: clear skb2->cb[] in ip6ip6_err()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2->cb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet's inet6_skb_parm in skb->cb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)->dsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2->cb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack.","state":0,"publishedAt":"2026-08-22T15:31:47.12+00:00","modifiedAt":"2026-10-16T19:06:00.036+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/ip6_tunnel.c\"\n ],\n \"versions\": [\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"44fe898df302e91c5ee5acbc71ffa74e78e6c183\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"0dadb0620ab65949a8bc2439dd28ea3c942fe87d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"b6816536a2990c0db44a26130a03e40b441e829b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"64e41736a26f37ab6215bc2e6df125df05aceb08\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"484134e1eb07d700a73b1e4bbf3fb503e299be60\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"4eb15c465337b18f44716c499cd6ad63eee0ad54\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"fbf40faa0414b753212494ad197542002e66ed9e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\n \"lessThan\": \"f803c086399da277b5d0ff36a107d0f162751800\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/ip6_tunnel.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.22\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.22\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.152\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.104\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.45\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.9\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183","https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d","https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b","https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08","https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60","https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54","https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e","https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74597","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74597","identifiers":["CVE-2026-74597"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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