ipv4: stop exception dump when nexthop group shrinks
In 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.
CVE-2026-99073
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-99073
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4ce5dc9316de50e0da84beafe55d1344f829cece",
"lessThan": "f91e472821e32f58b03eb631e20a67157e2b928b",
"versionType": "git"
},
{
"status": "affected",
"version": "4ce5dc9316de50e0da84beafe55d1344f829cece",
"lessThan": "21cba134c30c17ae55f468b5809336437df5d7e6",
"versionType": "git"
},
{
"status": "affected",
"version": "4ce5dc9316de50e0da84beafe55d1344f829cece",
"lessThan": "b9a30bb7b831e8c5a47fadbdf1760918aaf009cc",
"versionType": "git"
},
{
"status": "affected",
"version": "4ce5dc9316de50e0da84beafe55d1344f829cece",
"lessThan": "4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/route.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/route.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99073
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #52897 · Revision 1
- Added to Heist Feed
- Publisher date