LoongArch Vulnerability in Linux Kernel

CVE-2025-21803

Summary

A vulnerability in the Linux kernel's handling of ACPI wakeup functionality affects the LoongArch architecture. The issue arises from the enable_gpe_wakeup() function, which indirectly leads to a thread switch due to mutex handling in acpi_enable_all_wakeup_gpes(). This results in the CPU remaining in an interrupt-enabled state post-execution, triggering warnings related to timekeeping. The root cause points to concurrent execution not being effectively managed during the sleep state transitions. A resolution similar to previous commits has been proposed to prevent this behavior, specifically by allowing direct invocation of acpi_hw_enable_all_wakeup_gpes() in enable_gpe_wakeup().

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