ipv4: do not warn on route notification size race

{
  "id": "47b2b1e095f3468f94caf6971126b0c00336b7a30e79b8fda88d02b368fc28a7",
  "url": "https://osv.dev/vulnerability/CVE-2026-99071",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ipv4: do not warn on route notification size race",
    "summary": "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.",
    "evidence": "osv:CVE-2026-99071",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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          {
            "value": "7.2.11",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-99071",
      "aliases": [
        "CVE-2026-99071"
      ],
      "affected": [
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-11-01T02:30:46.362537405Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/088ba80eef85fa7a5ad8f9e7c82b403c99242b56",
        "https://git.kernel.org/stable/c/096ad0cb77f8da1928d04a0d170535e14ca6311b",
        "https://git.kernel.org/stable/c/221ef5e1e44a044790f0f54e6aa237883f475a4d",
        "https://git.kernel.org/stable/c/78a1cf5c54b2f795c81fedb530755a8d01cc84f0",
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        "https://git.kernel.org/stable/c/8b35e7767fdee63e57948a1ec89d9238a651f8c6",
        "https://git.kernel.org/stable/c/e02a5b6588161673ef75a4bc5cdfb62bd493374d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99071.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-99071",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99071.json"
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      {
        "value": "CVE-2026-99071",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 509152,
  "published_at": "2026-10-23T12:23:14.297+00:00"
}