CVE-2026-64512

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ACPI: CPPC: Suppress UBSAN warning caused by field misuse<br /> <br /> The definition of reg-&gt;access_width changes depending on the<br /> reg-&gt;space_id type. Type ACPI_ADR_SPACE_PLATFORM_COMM uses<br /> access_width to indicate the PCC region, which can result in a UBSAN<br /> if the value is greater than 4.<br /> <br /> For example:<br /> <br /> UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9<br /> shift exponent 32 is too large for 32-bit type &amp;#39;int&amp;#39;<br /> CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy)<br /> Hardware name: To be filled by O.E.M.<br /> Call trace:<br /> ...(trimming)<br /> ubsan_epilogue+0x10/0x48<br /> __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0<br /> cpc_write+0x4d0/0x670<br /> cppc_set_perf+0x18c/0x490<br /> cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq]<br /> ... (trimming)<br /> <br /> Lets fix this by validating the region type, as well as whether<br /> access_width has a value. Then since we are returning bit_width<br /> directly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting<br /> the size.