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CVE-2025-22069 is a Linux kernel vulnerability affecting the RISC-V fgraph/ftrace return handling path. The bug is in the stack layout used by return_to_handler when constructing the argument passed to ftrace_return_to_handler: the constructed layout does not match the RISC-V __arch_ftrace_regs structure expected by ftrace_return_to_handler. As a result, when function graph tracing or related fprobe return tracing is exercised, the kernel can interpret malformed register/frame data and emit warnings such as "Bad frame pointer" from kernel/trace/fgraph.c. The issue was reproduced using tracing interfaces under /sys/kernel/debug/tracing with a return probe on do_nanosleep. The provided fix corrects the RISC-V stack layout so it matches the expected __arch_ftrace_regs format.
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