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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
e92bee9f861b466c676f0200be3e46af7bc4ac6b to < 55d52af498daea75aa03ba9b7e444c8ae495ac20affectede92bee9f861b466c676f0200be3e46af7bc4ac6b to < a305821f597ec943849d3e53924adb88c61ed682affectede92bee9f861b466c676f0200be3e46af7bc4ac6b to < 01098d893fa8a6edb2b56e178b798e3e6b674f02affectede003c485ac82a9f8de4204912ed059ac6dd4257caffected25b90cd122d546823da90b916f7c3289dfe83a99affected6.8.12 to < 6.9affected6.9.3 to < 6.10affected
Linux Linux
Default version status: affected
6.10affected0 to < 6.10unaffected6.12.34 to ≤ 6.12.*unaffected6.15.3 to ≤ 6.15.*unaffected6.16 to ≤ *unaffected