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CVE-2026-81665 is a heap-based buffer overflow in Corosync's Totem Process Group (totempg) fragmented multicast-message reassembly logic. The assembly buffer used to reconstruct fragmented messages lacks a runtime bounds check in release builds, allowing crafted fragment data to write beyond the heap allocation with attacker-controlled content.
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No public exploit code observed for this vulnerability.
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24 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap-based buffer overflow in the Corosync TotemPG assembly buffer during fragmented-message reassembly.
A vulnerability tracked as CVE-2026-81665 affecting Corosync-related packages on Rocky Linux 10, including corosync-vqsim and associated debug/source packages.
A CWE-122 heap-based buffer overflow vulnerability affecting Corosync packages in AlmaLinux 9 repositories, addressed by AlmaLinux advisory ALSA-2026-67873.
A vulnerability identified as CVE-2026-81665 affecting Corosync packages on Rocky Linux 9, including corosync, corosynclib, development, debug, and vqsim packages. The supplied CVSS v3 vector indicates adjacent-network attackability, high attack complexity, no privileges or user interaction required, and high confidentiality, integrity, and availability impact.
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.