ipv4: stop route notification sizing when nexthop group shrinks
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.
CVE-2026-99072
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-2026-99072
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": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "72d9d17092bb37b0717f12042a0817d01a1f9e78",
"versionType": "git"
},
{
"status": "affected",
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54",
"versionType": "git"
},
{
"status": "affected",
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49",
"versionType": "git"
},
{
"status": "affected",
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88",
"versionType": "git"
},
{
"status": "affected",
"version": "680aea08e78c003292415518ad270bc20f9c80b1",
"lessThan": "d3daa33c7af92e38f2274bbd2576f58bfbaf89e6",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/fib_semantics.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"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/fib_semantics.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99072
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #52896 · Revision 1
- Added to Heist Feed
- Publisher date