GHSA-4527-Q5WC-XRV7
Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31In the Linux kernel, the following vulnerability has been resolved:
ipv4: stop exception dump when nexthop group shrinks
Commit 4ce5dc9316de ("inet: switch inet_dump_fib() to RCU protection") allowed IPv4 FIB dumps to run concurrently with nexthop replacement.
fib_dump_info_fnhe() uses fib_info_num_path() as the loop bound, 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 the dump dereferences it through nhc_flags.
Stop the walk when the indexed path is absent. Nexthop groups are dense, so the current snapshot has no later path.
{
"affected": [],
"aliases": [
"CVE-2026-99073"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-23T13:17:31Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: stop exception dump when nexthop group shrinks\n\nCommit 4ce5dc9316de (\"inet: switch inet_dump_fib() to RCU\nprotection\") allowed IPv4 FIB dumps to run concurrently with nexthop\nreplacement.\n\nfib_dump_info_fnhe() uses fib_info_num_path() as the loop bound,\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 the dump dereferences it through\nnhc_flags.\n\nStop the walk when the indexed path is absent. Nexthop groups are\ndense, so the current snapshot has no later path.",
"id": "GHSA-4527-q5wc-xrv7",
"modified": "2026-10-23T15:31:37Z",
"published": "2026-10-23T15:31:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99073"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/21cba134c30c17ae55f468b5809336437df5d7e6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9a30bb7b831e8c5a47fadbdf1760918aaf009cc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f91e472821e32f58b03eb631e20a67157e2b928b"
}
],
"schema_version": "1.4.0",
"severity": []
}
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