CVE-2026-93167
UnknownSummary
In the Linux kernel, the syscall trace path reloads syscall arguments from pt_regs before calling the handler. On C-SKY ABIv2, the code adjusts sp before loading LSAVE_A4 and LSAVE_A5, so the wrong slots are fetched and traced syscalls using the 5th or 6th argument (e.g., mmap2) receive corrupted arguments. The fix loads a4/a5 from pt_regs before changing sp.
Risk Assessment
Traced processes on the C-SKY ABIv2 architecture may receive corrupted syscall arguments, leading to incorrect operation results (e.g., mmap failure) and unpredictable application behavior. The issue mainly affects debugging environments on this architecture.
Recommendation
Update the Linux kernel to a version containing the C-SKY syscall trace path fix. Limit the use of PTRACE_SYSCALL on the C-SKY architecture until the fix is deployed.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: csky: Fix a4/a5 restoration in syscall trace path The syscall trace path reloads syscall arguments from pt_regs before calling the syscall handler. On C-SKY ABIv2, the 5th and 6th syscall arguments are prepared as stack arguments before invoking syscallid. The current code adjusts sp before loading LSAVE_A4 and LSAVE_A5. Since those offsets are relative to the original pt_regs base, loading them after changing sp fetches the wrong slots. As a result, traced syscalls that use the 5th or 6th argument may receive corrupted arguments. This is visible with mmap2(), which takes six arguments. A small PTRACE_SYSCALL reproducer opens a file and maps one page with: mmap(NULL, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0) Before the fix, the traced child fails the mmap and exits with 12. After the fix, the mapping succeeds and the child exits with 0. Fix the trace path by loading a4/a5 from pt_regs before changing sp. Tested on: ck860f, linux-4.19.15, C-SKY abiv2
Vulnerability data from NVD (NIST) · CISA KEV · EPSS