CVE-2026-99070
Published Oct 23, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: do not warn on route notification size race fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later fills it with rt6_fill_node(). With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. rt6_fill_node() 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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References
Other References
https://git.kernel.org/stable/c/291fe0bafee78c95f9f2e7f579f17793fd5a1e5a
https://git.kernel.org/stable/c/4ac7d92a4698e34e614c254359665b9de1f65283
https://git.kernel.org/stable/c/7b112bd43f1172fb152e848570a957467008a5ae
https://git.kernel.org/stable/c/8a3b935b6b6037eefb36bd27a60793a008358e8d
https://git.kernel.org/stable/c/c97426ec649d99596d8969e1a052c16b14b7b485
Frequently Asked Questions
What is CVE-2026-99070? +
In the Linux kernel, the following vulnerability has been resolved:
ipv6: do not warn on route notification size race
fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later
fills it with rt6_fill_node(). With nexthop compatibility mode enabled,
a concurrent replacement can grow the group between these independent
snapshots. rt6_fill_node() 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.
How do I check if I'm vulnerable to CVE-2026-99070? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.