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CVE-2025-22056 is a heap out-of-bounds write in the Linux kernel Netfilter nft_tunnel component. While parsing multiple Geneve tunnel-option attributes, nft_tunnel_obj_init performs pointer type conversion before offset addition when locating successive geneve_opt structures. This incorrect pointer arithmetic produces an invalid destination position and can cause option data to be copied beyond the allocated heap object. The upstream fix uses correct byte-based pointer addition and conversion in both Geneve option parsing and dumping paths.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel netfilter nft_tunnel type-confusion vulnerability related to Geneve options.
Linux kernel nftables tunnel Geneve option type-confusion vulnerability.
Linux kernel nft_tunnel Geneve option type-confusion vulnerability.
A Linux kernel netfilter nft_tunnel flaw in Geneve option attribute parsing. Incorrect pointer addition/type conversion when multiple Geneve option attributes are processed can cause a heap out-of-bounds write.
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.