mpls: add seqcount to protect the platform_label{,s} pair

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Summary

CVECVE-2026-43042
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:50 UTC
Updated2026-05-01 15:24:14 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7720c01f3f590116882e251f13c7e1d5602f8643 5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef git Not specified
CNA Linux Linux affected 7720c01f3f590116882e251f13c7e1d5602f8643 629ec78ef8608d955ce217880cdc3e1873af3a15 git Not specified
CNA Linux Linux affected 4.1 Not specified
CNA Linux Linux unaffected 4.1 semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/629ec78ef8608d955ce217880cdc3e1873af3a15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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