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CVE-2021-3612 is an out-of-bounds memory-access vulnerability in the Linux kernel joystick-device (joydev) subsystem's handling of the JSIOCSBTNMAP ioctl. Malformed button-map input, including a zero-size value or crafted data, can cause joydev_handle_JSIOCSBTNMAP() to perform an out-of-bounds write and panic the kernel. The write condition was introduced by an upstream change and affects upstream kernels beginning with v5.12-rc1. Earlier affected kernels exhibited an out-of-bounds stack-read condition through the same ioctl path.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel joydev input-driver flaw caused by a zero-sized button-map request.
Linux kernel joydev input-driver flaw involving a zero-size value passed to joydev_handle_JSIOCSBTNMAP().
Linux kernel joydev flaw involving a zero-size value passed to joydev_handle_JSIOCSBTNMAP().
Linux kernel joydev vulnerability involving a zero-sized button-map input.
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.