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CVE-2021-47393 is an out-of-bounds read vulnerability in the Linux kernel hwmon mlxreg-fan driver. When a minimum fan speed is enforced through the driver's sysfs interface, the requested cooling-device state can exceed the nominal fan-speed maximum. The driver incorrectly reports success for this configuration request, allowing thermal_cooling_device_stats_update() to update thermal statistics using the out-of-range state as a table index. With CONFIG_THERMAL_STATISTICS enabled, this results in a slab out-of-bounds read. The upstream correction returns a nonzero value for sysfs-enforced fan states, preventing the invalid thermal-statistics update.
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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 mlxreg-fan hardware-monitoring driver flaw related to sysfs-enforced fan state handling.
Linux kernel mlxreg-fan hardware-monitor driver flaw.
Linux kernel mlxreg-fan hardware-monitoring driver flaw involving erroneous return handling when fan state is enforced through sysfs.
Linux kernel mlxreg-fan hardware-monitoring driver flaw involving enforcement of fan current state through sysfs.
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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.