Riskcovery

CVE-2026-99071

ipv4: do not warn on route notification size race

State
Published
Severity
Not scored
Published
Oct 23, 2026
Updated
Oct 30, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 680aea08e78c003292415518ad270bc20f9c80b1 to before 8b35e7767fdee63e57948a1ec89d9238a651f8c6Affected
  • 680aea08e78c003292415518ad270bc20f9c80b1 to before 096ad0cb77f8da1928d04a0d170535e14ca6311bAffected
  • 680aea08e78c003292415518ad270bc20f9c80b1 to before 088ba80eef85fa7a5ad8f9e7c82b403c99242b56Affected
  • 680aea08e78c003292415518ad270bc20f9c80b1 to before 78a1cf5c54b2f795c81fedb530755a8d01cc84f0Affected
  • 680aea08e78c003292415518ad270bc20f9c80b1 to before 7dfa7ca97f3ac46353edd4cc44f7733758e4535bAffected
  • 680aea08e78c003292415518ad270bc20f9c80b1 to before 221ef5e1e44a044790f0f54e6aa237883f475a4dAffected
  • 680aea08e78c003292415518ad270bc20f9c80b1 to before e02a5b6588161673ef75a4bc5cdfb62bd493374dAffected
LinuxLinux
  • 5.12Affected
  • before 5.12Not affected
  • 5.15.224 through 5.15.*Not affected
  • 6.1.191 through 6.1.*Not affected
  • 6.6.160 through 6.6.*Not affected
  • 6.12.113 through 6.12.*Not affected
  • 6.18.57 through 6.18.*Not affected
  • 7.2.11 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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