CVE-2026-99071 (GCVE-0-2026-99071)
Vulnerability from cvelistv5
Published
2026-10-23 12:23
Modified
2026-10-30 12:41
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 680aea08e78c003292415518ad270bc20f9c80b1
Version: 680aea08e78c003292415518ad270bc20f9c80b1
Version: 680aea08e78c003292415518ad270bc20f9c80b1
Version: 680aea08e78c003292415518ad270bc20f9c80b1
Version: 680aea08e78c003292415518ad270bc20f9c80b1
Version: 680aea08e78c003292415518ad270bc20f9c80b1
Version: 680aea08e78c003292415518ad270bc20f9c80b1
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: do not warn on route notification size race\n\nCommit 680aea08e78c (\"net: ipv4: Emit notification when fib hardware\nflags are changed\") added asynchronous route notifications for hardware\nflag changes.\n\nfib_alias_hw_flags_set() sizes the skb with fib_nlmsg_size() and later\nfills it with fib_dump_info() while holding only RCU.  With nexthop\ncompatibility mode enabled, a concurrent replacement can grow the group\nbetween these independent snapshots.  fib_dump_info() can then\nlegitimately return -EMSGSIZE, so the warning does not prove a sizing bug.\n\nRemove the warning.  The existing error path still frees the skb and\nreports the error to listeners."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:30.940Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/e02a5b6588161673ef75a4bc5cdfb62bd493374d"
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    "datePublished": "2026-10-23T12:23:14.297Z",
    "dateReserved": "2026-09-25T10:25:14.389Z",
    "dateUpdated": "2026-10-30T12:41:30.940Z",
    "state": "PUBLISHED"
  },
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}


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