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CVE-2021-3564 is a double-free memory-corruption vulnerability in the Linux kernel Bluetooth subsystem. When initialization of an HCI device fails, a locally attached malicious HCI TTY Bluetooth device can cause memory to be freed more than once. The issue affects Linux kernel versions beginning with 3.13.
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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.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel Bluetooth subsystem double-free vulnerability during failed HCI-device initialization.
Double-free vulnerability in the Linux kernel Bluetooth subsystem upon HCI-device initialization failure.
A double-free vulnerability in the Linux kernel Bluetooth subsystem during failed HCI device initialization.
Linux kernel Bluetooth-subsystem double-free vulnerability triggered when HCI device initialization fails.
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.