CVE-2026-29642

A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as "writes preserve values, reads ignore values," i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.

The following products are affected by CVE-2026-29642 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-29642.

URL	Resource
https://docs.riscv.org/reference/isa/priv/machine.html
https://docs.riscv.org/reference/isa/priv/priv-csrs.html
https://github.com/OpenXiangShan/XiangShan/commit/5e3dd63
https://github.com/OpenXiangShan/XiangShan/issues/3934