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CVE-2026-31692 is a Linux kernel vulnerability in the rtnetlink subsystem. The flaw is in rtnl_newlink(), which failed to enforce a CAP_NET_ADMIN capability check against the peer network namespace when creating paired network devices such as veth, vxcan, and netkit. Because the code did not verify administrative capability in the target peer namespace, an unprivileged user operating inside a user namespace could request creation of interfaces in arbitrary network namespaces, including the initial network namespace. The vulnerability was resolved by adding a netlink_ns_capable() check for CAP_NET_ADMIN in the peer namespace before permitting device creation.
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A Linux kernel vulnerability in rtnetlink involving a missing netlink_ns_capable() check for peer network namespaces.
A Linux kernel rtnetlink vulnerability involving a missing netlink_ns_capable() check for peer network namespaces.
A Linux kernel privilege/authorization flaw in rtnl_newlink() where a missing CAP_NET_ADMIN check on the peer network namespace allows an unprivileged user with a user namespace to create paired interfaces in arbitrary network namespaces, including init_net.
A Linux kernel rtnetlink vulnerability caused by a missing netlink_ns_capable() check for peer network namespaces.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.