CVE-2025-38689

CVE-2025-38689 affects the Linux kernel’s x86 FPU code. When CONFIG_X86_DEBUG_FPU is enabled, AVX-512 timestamp handling calls x86_task_fpu() without a NULL check, returning NULL for kernel threads (PF_KTHREAD) and triggering a NULL pointer dereference when reading /proc/[kthread]/arch_status. Th...