CVE-2026-99071
Full vulnerability record from the local CVENow database.
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.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-23 13:17:31.027000
Last modified
2026-10-30 13:21:43.410000
View original CVE JSON
{
"id": "CVE-2026-99071",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-23T13:17:31.027",
"lastModified": "2026-10-30T13:21:43.410",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/ipv4/fib_trie.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "8b35e7767fdee63e57948a1ec89d9238a651f8c6",
"versionType": "git",
"status": "affected"
},
{
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "096ad0cb77f8da1928d04a0d170535e14ca6311b",
"versionType": "git",
"status": "affected"
},
{
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "088ba80eef85fa7a5ad8f9e7c82b403c99242b56",
"versionType": "git",
"status": "affected"
},
{
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "78a1cf5c54b2f795c81fedb530755a8d01cc84f0",
"versionType": "git",
"status": "affected"
},
{
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "7dfa7ca97f3ac46353edd4cc44f7733758e4535b",
"versionType": "git",
"status": "affected"
},
{
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "221ef5e1e44a044790f0f54e6aa237883f475a4d",
"versionType": "git",
"status": "affected"
},
{
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "e02a5b6588161673ef75a4bc5cdfb62bd493374d",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/ipv4/fib_trie.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.12",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.113",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.57",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.11",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/088ba80eef85fa7a5ad8f9e7c82b403c99242b56",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/096ad0cb77f8da1928d04a0d170535e14ca6311b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/221ef5e1e44a044790f0f54e6aa237883f475a4d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/78a1cf5c54b2f795c81fedb530755a8d01cc84f0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7dfa7ca97f3ac46353edd4cc44f7733758e4535b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8b35e7767fdee63e57948a1ec89d9238a651f8c6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e02a5b6588161673ef75a4bc5cdfb62bd493374d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}