CVE-2026-99072 (GCVE-0-2026-99072)
Vulnerability from cvelistv5
Published
2026-10-23 12:23
Modified
2026-10-30 12:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv4: stop route notification sizing when nexthop group shrinks
Commit 680aea08e78c ("net: ipv4: Emit notification when fib
hardware flags are changed") added an RCU-only fib_nlmsg_size() call
for asynchronous hardware flag notifications.
fib_nlmsg_size() checks fib_info_num_path() before each iteration,
then fib_info_nhc() independently reloads nh->nh_grp. If
RTM_NEWNEXTHOP replaces a group with fewer paths between those loads,
fib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences
it.
Stop sizing when the indexed path is absent. Nexthop groups are
dense, so the current snapshot has no later path.
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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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: stop route notification sizing when nexthop group shrinks\n\nCommit 680aea08e78c (\"net: ipv4: Emit notification when fib\nhardware flags are changed\") added an RCU-only fib_nlmsg_size() call\nfor asynchronous hardware flag notifications.\n\nfib_nlmsg_size() checks fib_info_num_path() before each iteration,\nthen fib_info_nhc() independently reloads nh-\u003enh_grp. If\nRTM_NEWNEXTHOP replaces a group with fewer paths between those loads,\nfib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences\nit.\n\nStop sizing when the indexed path is absent. Nexthop groups are\ndense, so the current snapshot has no later path."
}
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"providerMetadata": {
"dateUpdated": "2026-10-30T12:41:31.995Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/96f3fbb8575593657c7e80786dc3251d2fe3931b"
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{
"url": "https://git.kernel.org/stable/c/81f0deb02a5b5477f236bbbaed1149b779a8632b"
},
{
"url": "https://git.kernel.org/stable/c/72d9d17092bb37b0717f12042a0817d01a1f9e78"
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{
"url": "https://git.kernel.org/stable/c/ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54"
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},
{
"url": "https://git.kernel.org/stable/c/d3daa33c7af92e38f2274bbd2576f58bfbaf89e6"
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"title": "ipv4: stop route notification sizing when nexthop group shrinks",
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"cveId": "CVE-2026-99072",
"datePublished": "2026-10-23T12:23:15.735Z",
"dateReserved": "2026-09-25T10:25:14.389Z",
"dateUpdated": "2026-10-30T12:41:31.995Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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