{"id":"CVE-2026-74597","summary":"ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2-\u003ecb[] 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-\u003ecb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)-\u003edsthao\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-\u003ecb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack.","modified":"2026-08-27T11:30:26.912727642Z","published":"2026-08-22T15:31:47.120Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74597.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183"},{"type":"WEB","url":"https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74597.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74597"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e490d1d85cf5e191791979e5f260d32eb4f703a8"},{"fixed":"44fe898df302e91c5ee5acbc71ffa74e78e6c183"},{"fixed":"0dadb0620ab65949a8bc2439dd28ea3c942fe87d"},{"fixed":"b6816536a2990c0db44a26130a03e40b441e829b"},{"fixed":"64e41736a26f37ab6215bc2e6df125df05aceb08"},{"fixed":"484134e1eb07d700a73b1e4bbf3fb503e299be60"},{"fixed":"4eb15c465337b18f44716c499cd6ad63eee0ad54"},{"fixed":"fbf40faa0414b753212494ad197542002e66ed9e"},{"fixed":"f803c086399da277b5d0ff36a107d0f162751800"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74597.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.22"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74597.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}