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CVE-2026-53221 is an incorrect tunnel-selection vulnerability in the Linux kernel IPv6 Virtual Tunnel Interface (ip6_vti) subsystem. In vti6_tnl_lookup(), failure to find an exact tunnel match triggers fallback searches for tunnels with wildcard remote or local addresses. Different tunnel types share a hash table and can collide; the fallback loops did not verify that a candidate actually used the required wildcard address. Consequently, a packet can be matched to an unintended IPv6 VTI tunnel.
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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.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.