High 7.1Published May 1, 2026

CVE-2026-43042mpls: add seqcount to protect the platform_label{,s} pair

Updated under an hour ago (Oct 27, 2026, 10:23 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	7720c01f3f590116882e251f13c7e1d5602f8643 builds before 0d377825548fe598595b5a5fa4a309fb593d8fb4; 7720c01f3f590116882e251f13c7e1d5602f8643 builds before 8adc5b6fc876928d8c95555d30b66fa50b07421e; 7720c01f3f590116882e251f13c7e1d5602f8643 builds before 5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef; 7720c01f3f590116882e251f13c7e1d5602f8643 builds before 629ec78ef8608d955ce217880cdc3e1873af3a15	CNA record
linux linux_kernel linux:linux_kernel	from 4.1 before 6.19.12; 7.0; 7.0; 7.0; 7.0; 7.0; 7.0	NVD

References

References

https://git.kernel.org/stable/c/0d377825548fe598595b5a5fa4a309fb593d8fb4
https://git.kernel.org/stable/c/8adc5b6fc876928d8c95555d30b66fa50b07421e
https://git.kernel.org/stable/c/5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef	patch
https://git.kernel.org/stable/c/629ec78ef8608d955ce217880cdc3e1873af3a15	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.