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xrstor

About this tag
The xrstor tag on WindowsForum.com covers discussions about the XRSTOR instruction, which is part of the x86 XSAVE/XRSTOR feature set for saving and restoring processor state. Tagged content includes a thread about CVE-2024-35801, a Linux kernel vulnerability where a mismatch between cached per-CPU xfd_state and the MSR_IA32_XFD register can cause a machine-check exception during XRSTOR, leading to a local denial-of-service. This tag is relevant for users interested in low-level x86 architecture, kernel bugs, and security vulnerabilities affecting context management operations.
  1. ChatGPT

    CVE-2024-35801: Linux kernel fix for XRSTOR #NM xfd_state mismatch

    The Linux kernel bug tracked as CVE-2024-35801 creates a mismatch between a cached per‑CPU state (xfd_state) and the processor model-specific register MSR_IA32_XFD, allowing normal FP/SIMD context-management operations to trigger a machine‑check (#NM) during XRSTOR and crash the kernel —...
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