CVE-2025-38169 - Linux Kernel ARM64 FPSIMD State Clobbering Vulnerability

CVE-2025-38169 - Linux Kernel ARM64 FPSIMD State Clobbering Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Thu, 07/03/2025 - 14:28
CVE ID : CVE-2025-38169
Published : July 3, 2025, 9:15 a.m. | 1 hour, 54 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP On system with SME, a thread's kernel FPSIMD state may be erroneously clobbered during a context switch immediately after that state is restored. Systems without SME are unaffected. If the CPU happens to be in streaming SVE mode before a context switch to a thread with kernel FPSIMD state, fpsimd_thread_switch() will restore the kernel FPSIMD state using fpsimd_load_kernel_state() while the CPU is still in streaming SVE mode. When fpsimd_thread_switch() subsequently calls fpsimd_flush_cpu_state(), this will execute an SMSTOP, causing an exit from streaming SVE mode. The exit from streaming SVE mode will cause the hardware to reset a number of FPSIMD/SVE/SME registers, clobbering the FPSIMD state. Fix this by calling fpsimd_flush_cpu_state() before restoring the kernel FPSIMD state.
Severity: 0.0 | NA
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