Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: riscv: ptrace: Zero-initialize regset buffers before copyin user_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET request with a short iov_len leaves the rest of the stack buffer uninitialized. In riscv_vr_set() that garbage is validated and copied into the target's vstate, and in riscv_cfi_set() it can be stored as the target's shadow stack pointer. Zero both buffers, as the get path already does.
References
- https://git.kernel.org/stable/c/59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97
- https://git.kernel.org/stable/c/89fc70d73f4ac8781f9e15edd1dbc6b6088453b3
FAQ
What is CVE-2026-98951?
CVE-2026-98951 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: riscv: ptrace: Zero-initialize regset buffers before copyin user_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET ...
How severe is CVE-2026-98951?
CVSS scoring is not yet available for CVE-2026-98951. Check NVD for updates.
Is there a patch for CVE-2026-98951?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.