{"id":"CVE-2026-99071","title":"ipv4: do not warn on route notification size race","summary":"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 not…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 088ba80eef85fa7a5ad8f9e7c82b403c99242b56","Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 78a1cf5c54b2f795c81fedb530755a8d01cc84f0","Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 7dfa7ca97f3ac46353edd4cc44f7733758e4535b","Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 221ef5e1e44a044790f0f54e6aa237883f475a4d","Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < e02a5b6588161673ef75a4bc5cdfb62bd493374d","Linux 5.12"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T12:23:14.297Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99071","references":[{"url":"https://git.kernel.org/stable/c/088ba80eef85fa7a5ad8f9e7c82b403c99242b56"},{"url":"https://git.kernel.org/stable/c/78a1cf5c54b2f795c81fedb530755a8d01cc84f0"},{"url":"https://git.kernel.org/stable/c/7dfa7ca97f3ac46353edd4cc44f7733758e4535b"},{"url":"https://git.kernel.org/stable/c/221ef5e1e44a044790f0f54e6aa237883f475a4d"},{"url":"https://git.kernel.org/stable/c/e02a5b6588161673ef75a4bc5cdfb62bd493374d"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.515Z","slug":"CVE-2026-99071","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 088ba80eef85fa7a5ad8f9e7c82b403c99242b56`\n- `Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 78a1cf5c54b2f795c81fedb530755a8d01cc84f0`\n- `Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 7dfa7ca97f3ac46353edd4cc44f7733758e4535b`\n- `Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 221ef5e1e44a044790f0f54e6aa237883f475a4d`\n- `Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < e02a5b6588161673ef75a4bc5cdfb62bd493374d`\n- `Linux 5.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}