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CVE-2026-99071

UnknownEPSS 0.20%

Last modified

CVE-2026-99071 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.20%

9.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 680aea08e78c003292415518ad270bc20f9c80b1, < 8b35e7767fdee63e57948a1ec89d9238a651f8c6; >= 680aea08e78c003292415518ad270bc20f9c80b1, < 096ad0cb77f8da1928d04a0d170535e14ca6311b; >= 680aea08e78c003292415518ad270bc20f9c80b1, < 088ba80eef85fa7a5ad8f9e7c82b403c99242b56; >= 680aea08e78c003292415518ad270bc20f9c80b1, < 78a1cf5c54b2f795c81fedb530755a8d01cc84f0; >= 680aea08e78c003292415518ad270bc20f9c80b1, < 7dfa7ca97f3ac46353edd4cc44f7733758e4535b; >= 680aea08e78c003292415518ad270bc20f9c80b1, < 221ef5e1e44a044790f0f54e6aa237883f475a4d; >= 680aea08e78c003292415518ad270bc20f9c80b1, < e02a5b6588161673ef75a4bc5cdfb62bd493374d
LinuxLinux5.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-99071?
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.
How severe is CVE-2026-99071?
Severity scoring for CVE-2026-99071 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-99071?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST