mpls: add seqcount to protect the platform_label{,s} pair
In the Linux kernel, the following vulnerability has been resolved: mpls: add seqcount to protect the platform_label{,s} pair The RCU-protected codepaths (mpls_forward, mpls_dump_routes) can have an inconsistent view of platform_labels vs platform_label in case of a concurrent resize (resize_platform_label_table, under platform_mutex). This can lead to OOB accesses. This patch adds a seqcount, so that we get a consistent snapshot. Note that mpls_label_ok is also susceptible to this, so the check against RTA_DST in rtm_to_route_config, done outside platform_mutex, is not sufficient. This value gets passed to mpls_label_ok once more in both mpls_route_add and mpls_route_del, so there is no issue, but that additional check must not be removed.
CVE-2026-43042
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-2026-43042
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": "7720c01f3f590116882e251f13c7e1d5602f8643",
"lessThan": "0d377825548fe598595b5a5fa4a309fb593d8fb4",
"versionType": "git"
},
{
"status": "affected",
"version": "7720c01f3f590116882e251f13c7e1d5602f8643",
"lessThan": "8adc5b6fc876928d8c95555d30b66fa50b07421e",
"versionType": "git"
},
{
"status": "affected",
"version": "7720c01f3f590116882e251f13c7e1d5602f8643",
"lessThan": "5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef",
"versionType": "git"
},
{
"status": "affected",
"version": "7720c01f3f590116882e251f13c7e1d5602f8643",
"lessThan": "629ec78ef8608d955ce217880cdc3e1873af3a15",
"versionType": "git"
}
],
"programFiles": [
"include/net/netns/mpls.h",
"net/mpls/af_mpls.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/netns/mpls.h",
"net/mpls/af_mpls.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43042
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46251 · Revision 1
- Added to Heist Feed
- Publisher date