In the Linux kernel, the following vulnerability has been resolved:

ACPI: CPPC: Suppress UBSAN warning caused by field misuse

The definition of reg->access_width changes depending on the
reg->space_id type.  Type ACPI_ADR_SPACE_PLATFORM_COMM uses
access_width to indicate the PCC region, which can result in a UBSAN
if the value is greater than 4.

For example:

 UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9
 shift exponent 32 is too large for 32-bit type 'int'
 CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy)
 Hardware name: To be filled by O.E.M.
 Call trace:
  ...(trimming)
  ubsan_epilogue+0x10/0x48
  __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0
  cpc_write+0x4d0/0x670
  cppc_set_perf+0x18c/0x490
  cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq]
  ... (trimming)

Lets fix this by validating the region type, as well as whether
access_width has a value. Then since we are returning bit_width
directly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting
the size.

https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1

https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99

https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c

https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2

https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9

https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2

https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b

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