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CVE-2026-46037 is an out-of-bounds access vulnerability in the Linux kernel IPv4 ICMP reply-handling path. Extended echo replies use the ICMP_EXT_ECHOREPLY outbound reply type, which is outside the valid index range of the icmp_pointers array that defines traditional ICMP types. The vulnerable code consulted this array before validating the reply type. The fix rejects reply types outside the traditional ICMP range before the lookup and applies array_index_nospec() to valid in-range accesses.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
39 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Insufficient ICMP reply-type validation in the Linux kernel IPv4 ICMP implementation.
Linux kernel IPv4 ICMP vulnerability caused by using icmp_pointers before validating the reply type.
Linux kernel IPv4 ICMP vulnerability caused by using icmp_pointers without first validating the reply type.
Improper ICMP reply-type validation in the Linux kernel IPv4 ICMP implementation.
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.