UBSAN Shift-Out-of-Bounds Issue in Intel RAPL Component of Linux Kernel

CVE-2022-50366

What is CVE-2022-50366?

The Linux kernel's Intel RAPL (Running Average Power Limit) component contains a vulnerability that leads to a UBSAN shift-out-of-bounds issue. When a given value is less than the defined time unit, a parameter passed to ilog2() can yield a zero result, resulting in a return value of -1. This scenario produces a shift exponent far exceeding the permissible range for a 32-bit integer, which raises the risk of undefined behavior. Immediate remediation is advised to mitigate potential exploitation risks.

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