Not yet scoredPublished Oct 23, 2026

CVE-2026-99071ipv4: do not warn on route notification size race

Updated under an hour ago (Oct 27, 2026, 9:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 23, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	680aea08e78c003292415518ad270bc20f9c80b1 builds before 088ba80eef85fa7a5ad8f9e7c82b403c99242b56; 680aea08e78c003292415518ad270bc20f9c80b1 builds before 78a1cf5c54b2f795c81fedb530755a8d01cc84f0; 680aea08e78c003292415518ad270bc20f9c80b1 builds before 7dfa7ca97f3ac46353edd4cc44f7733758e4535b; 680aea08e78c003292415518ad270bc20f9c80b1 builds before 221ef5e1e44a044790f0f54e6aa237883f475a4d; from 680aea08e78c003292415518ad270bc20f9c80b1 before e02a5b6588161673ef75a4bc5cdfb62bd493374d	CNA record

References

References

https://git.kernel.org/stable/c/088ba80eef85fa7a5ad8f9e7c82b403c99242b56
https://git.kernel.org/stable/c/78a1cf5c54b2f795c81fedb530755a8d01cc84f0
https://git.kernel.org/stable/c/7dfa7ca97f3ac46353edd4cc44f7733758e4535b
https://git.kernel.org/stable/c/221ef5e1e44a044790f0f54e6aa237883f475a4d
https://git.kernel.org/stable/c/e02a5b6588161673ef75a4bc5cdfb62bd493374d

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.