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CVE-2021-47393 is a flaw in the Linux kernel hwmon mlxreg-fan driver’s handling of minimum fan-speed enforcement through sysfs. The driver permits special current-state values above the nominal maximum fan-speed state to enforce a minimum fan speed. When thermal statistics are enabled, processing such an out-of-range state through the normal thermal cooling-device statistics update path can index beyond the thermal statistics table, producing a slab out-of-bounds read. The upstream correction returns a non-zero status for sysfs-enforced fan states so that thermal_cooling_device_stats_update() is not invoked for values outside the statistics table range.
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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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.