{"id":"CVE-2026-31685","summary":"netfilter: ip6t_eui64: reject invalid MAC header for all packets","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_eui64: reject invalid MAC header for all packets\n\n`eui64_mt6()` derives a modified EUI-64 from the Ethernet source address\nand compares it with the low 64 bits of the IPv6 source address.\n\nThe existing guard only rejects an invalid MAC header when\n`par-\u003efragoff != 0`. For packets with `par-\u003efragoff == 0`, `eui64_mt6()`\ncan still reach `eth_hdr(skb)` even when the MAC header is not valid.\n\nFix this by removing the `par-\u003efragoff != 0` condition so that packets\nwith an invalid MAC header are rejected before accessing `eth_hdr(skb)`.","modified":"2026-04-26T04:22:21.682214Z","published":"2026-04-25T08:47:02.857Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31685.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55"},{"type":"WEB","url":"https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31685.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31685"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"9eda5478746ef7dc0e4e537b5a5e4b0ca1027091"},{"fixed":"807d6ee15804df6f01a35c910f09612e858739a6"},{"fixed":"309ae3e9a51a69699ca94eac5fac5688fa562d55"},{"fixed":"fdce0b3590f724540795b874b4c8850c90e6b0a8"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31685.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.12"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31685.json"}}],"schema_version":"1.7.5"}