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CVE-2026-52909 is a Linux kernel vulnerability in the ip6_vti tunnel driver. The per-network-namespace fallback tunnel device, ip6_vti0, was initialized without setting the netns_immutable flag in vti6_init_net(). Comparable tunnel drivers such as ip6_tunnel, sit, ip6_gre, and ip_tunnel correctly mark their fallback devices as immutable to prevent them from being moved across network namespaces. Because ip6_vti0 lacked this protection, the fallback device could be moved to another network namespace contrary to the intended isolation model.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.