{"id":"CVE-2026-74669","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74669","summary":"ipvs: clear IPv4 options after rebasing tunnel ICMP errors","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: clear IPv4 options after rebasing tunnel ICMP errors\n\nip_vs_in_icmp() rebases an skb from the outer ICMP packet to the\nquoted original request before passing it to icmp_send(). However,\nIPCB(skb)->opt still describes the outer IPv4 header.\n\nA timestamp option in the outer header can therefore leave an offset\nthat points into the quoted transport header after the rebase.\n__ip_options_echo() treats a byte at that stale location as the option\nlength and copies it into the fixed-size option storage on the\n__icmp_send() stack, causing a stack out-of-bounds write.\n\nClear the stale option metadata after resetting the network header.\nKeep the remaining control block fields, including the ingress\ninterface used by the ICMP response path.","published":"2026-08-22T15:32:40.221Z","modified":"2026-08-24T11:47:16.736619089Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.265"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74669.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74669"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-24T11:47:16.736619089Z"}}