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CVE-2021-43267 is a heap-based buffer overflow in the Linux kernel Transparent Inter-Process Communication (TIPC) crypto key-receive path. While processing MSG_CRYPTO messages, the vulnerable routine allocates a buffer according to the declared message payload size, then uses the attacker-controlled key-length field to copy cryptographic-key data before verifying that the effective key structure fits within the allocation. An attacker can provide a small declared payload together with a larger key length, causing an out-of-bounds heap write. The issue affects TIPC implementations in Linux kernel versions from 5.10-rc1 through affected 5.15 releases; fixes were incorporated upstream in late October 2021 and are available in kernel 5.14.16 and vendor-backported kernels.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown
Included in the advisory's CVE list; no vulnerability details are provided.
A Linux kernel vulnerability caused by insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.
A previously disclosed TIPC-related Linux kernel vulnerability referenced for background and related research; described here as a remote Linux kernel heap overflow.
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.