CVE-2026-99071None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: ipv4: do not warn on route notification size race Commit 680aea08e78c ("net: ipv4: Emit notification when fib hardware flags are changed") added asynchronous route not…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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In the Linux kernel, the following vulnerability has been resolved:
ipv4: do not warn on route notification size race
Commit 680aea08e78c ("net: ipv4: Emit notification when fib hardware flags are changed") added asynchronous route notifications for hardware flag changes.
fib_alias_hw_flags_set() sizes the skb with fib_nlmsg_size() and later fills it with fib_dump_info() while holding only RCU. With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. fib_dump_info() can then legitimately return -EMSGSIZE, so the warning does not prove a sizing bug.
Remove the warning. The existing error path still frees the skb and reports the error to listeners.
Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 088ba80eef85fa7a5ad8f9e7c82b403c99242b56Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 78a1cf5c54b2f795c81fedb530755a8d01cc84f0Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 7dfa7ca97f3ac46353edd4cc44f7733758e4535bLinux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 221ef5e1e44a044790f0f54e6aa237883f475a4dLinux >= 680aea08e78c003292415518ad270bc20f9c80b1 < e02a5b6588161673ef75a4bc5cdfb62bd493374dLinux 5.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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