Bug 2396107 (CVE-2022-50366)

Summary: CVE-2022-50366 kernel: powercap: intel_rapl: fix UBSAN shift-out-of-bounds issue
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-17 15:01:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

powercap: intel_rapl: fix UBSAN shift-out-of-bounds issue

When value < time_unit, the parameter of ilog2() will be zero and
the return value is -1. u64(-1) is too large for shift exponent
and then will trigger shift-out-of-bounds:

shift exponent 18446744073709551615 is too large for 32-bit type 'int'
Call Trace:
 rapl_compute_time_window_core
 rapl_write_data_raw
 set_time_window
 store_constraint_time_window_us
Comment 1 Keith Grant 2025-09-17 17:52:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091716-CVE-2022-50366-0f75@gregkh/T