CVE-2026-99071 is a vulnerability in Linux Kernel
Published on October 23, 2026
ipv4: do not warn on route notification size race
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.
Products Associated with CVE-2026-99071
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Affected Versions
Linux:- Version 680aea08e78c003292415518ad270bc20f9c80b1 and below 088ba80eef85fa7a5ad8f9e7c82b403c99242b56 is affected.
- Version 680aea08e78c003292415518ad270bc20f9c80b1 and below 78a1cf5c54b2f795c81fedb530755a8d01cc84f0 is affected.
- Version 680aea08e78c003292415518ad270bc20f9c80b1 and below 7dfa7ca97f3ac46353edd4cc44f7733758e4535b is affected.
- Version 680aea08e78c003292415518ad270bc20f9c80b1 and below 221ef5e1e44a044790f0f54e6aa237883f475a4d is affected.
- Version 680aea08e78c003292415518ad270bc20f9c80b1 and below e02a5b6588161673ef75a4bc5cdfb62bd493374d is affected.
- Version 5.12 is affected.
- Before 5.12 is unaffected.
- Version 6.6.160, <= 6.6.* is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.