Live › vulnerability › CVE-2026-99071
Go to dashboardWhen hardware flags on an IPv4 route change while nexthop groups are being replaced, the kernel can build a route notification that is too small and then hit a warning path. The fix removes that warning; the error path that frees the buffer and reports the failure is unchanged.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Systems running a Linux kernel with IPv4 routing and nexthop compatibility mode enabled, where routes are offloaded to hardware and replaced concurrently. The sources do not say which kernel versions are affected or whether the warning has any security consequence beyond log noise.
No product ranges from the sources yet.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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