{"id":"CVE-2026-99071","summary":"ipv4: do not warn on route notification size race","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: do not warn on route notification size race\n\nCommit 680aea08e78c (\"net: ipv4: Emit notification when fib hardware\nflags are changed\") added asynchronous route notifications for hardware\nflag changes.\n\nfib_alias_hw_flags_set() sizes the skb with fib_nlmsg_size() and later\nfills it with fib_dump_info() while holding only RCU.  With nexthop\ncompatibility mode enabled, a concurrent replacement can grow the group\nbetween these independent snapshots.  fib_dump_info() can then\nlegitimately return -EMSGSIZE, so the warning does not prove a sizing bug.\n\nRemove the warning.  The existing error path still frees the skb and\nreports the error to listeners.","modified":"2026-11-01T02:30:53.107749341Z","published":"2026-10-23T12:23:14.297Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99071.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/088ba80eef85fa7a5ad8f9e7c82b403c99242b56"},{"type":"WEB","url":"https://git.kernel.org/stable/c/096ad0cb77f8da1928d04a0d170535e14ca6311b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/221ef5e1e44a044790f0f54e6aa237883f475a4d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/78a1cf5c54b2f795c81fedb530755a8d01cc84f0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7dfa7ca97f3ac46353edd4cc44f7733758e4535b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b35e7767fdee63e57948a1ec89d9238a651f8c6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e02a5b6588161673ef75a4bc5cdfb62bd493374d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99071.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99071"},{"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":"680aea08e78c003292415518ad270bc20f9c80b1"},{"fixed":"8b35e7767fdee63e57948a1ec89d9238a651f8c6"},{"fixed":"096ad0cb77f8da1928d04a0d170535e14ca6311b"},{"fixed":"088ba80eef85fa7a5ad8f9e7c82b403c99242b56"},{"fixed":"78a1cf5c54b2f795c81fedb530755a8d01cc84f0"},{"fixed":"7dfa7ca97f3ac46353edd4cc44f7733758e4535b"},{"fixed":"221ef5e1e44a044790f0f54e6aa237883f475a4d"},{"fixed":"e02a5b6588161673ef75a4bc5cdfb62bd493374d"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99071.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.12.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99071.json"}}],"schema_version":"1.9.2"}