CVE-2026-99071
ipv4: do not warn on route notification size race
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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.
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < 088ba80eef85fa7a5ad8f9e7c82b403c99242b56 affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < 78a1cf5c54b2f795c81fedb530755a8d01cc84f0 affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < 7dfa7ca97f3ac46353edd4cc44f7733758e4535b affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < 221ef5e1e44a044790f0f54e6aa237883f475a4d affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < e02a5b6588161673ef75a4bc5cdfb62bd493374d default: unaffected |
| Linux | Linux | affected: 5.12 unaffected: 0 … < 5.12 unaffected: 6.6.160 … <= 6.6.* unaffected: 6.12.113 … <= 6.12.* unaffected: 6.18.57 … <= 6.18.* unaffected: 7.2.11 … <= 7.2.* unaffected: 7.3 … <= * default: affected |
Open-source packages (GitHub Advisory / OSV)
ipv4: do not warn on route notification size race
| Ecosystem | Package | Affected versions | Fixed in |
|---|---|---|---|
| >= 680aea08e78c003292415518ad270bc20f9c80b1, < 088ba80eef85fa7a5ad8f9e7c82b403c99242b56; < 78a1cf5c54b2f795c81fedb530755a8d01cc84f0; < 7dfa7ca97f3ac46353edd4cc44f7733758e4535b; < 221ef5e1e44a044790f0f54e6aa237883f475a4d; < e02a5b6588161673ef75a4bc5cdfb62bd493374d | 088ba80eef85fa7a5ad8f9e7c82b403c99242b56, 78a1cf5c54b2f795c81fedb530755a8d01cc84f0, 7dfa7ca97f3ac46353edd4cc44f7733758e4535b, 221ef5e1e44a044790f0f54e6aa237883f475a4d, e02a5b6588161673ef75a4bc5cdfb62bd493374d | ||
| Linux | Kernel | >= 5.12.0, < 6.6.160; >= 6.7.0, < 6.12.113; >= 6.13.0, < 6.18.57; >= 6.19.0, < 7.2.11 | 6.6.160, 6.12.113, 6.18.57, 7.2.11 |
Linux distribution status
References (8)
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git OSV
- https://git.kernel.org/stable/c/088ba80eef85fa7a5ad8f9e7c82b403c99242b56 NVD, CNA, OSV
- https://git.kernel.org/stable/c/221ef5e1e44a044790f0f54e6aa237883f475a4d NVD, CNA, OSV
- https://git.kernel.org/stable/c/78a1cf5c54b2f795c81fedb530755a8d01cc84f0 NVD, CNA, OSV
- https://git.kernel.org/stable/c/7dfa7ca97f3ac46353edd4cc44f7733758e4535b NVD, CNA, OSV
- https://git.kernel.org/stable/c/e02a5b6588161673ef75a4bc5cdfb62bd493374d NVD, CNA, OSV
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99071.json OSV
- https://nvd.nist.gov/vuln/detail/CVE-2026-99071 OSV