CVE-2026-29642 - XiangShan RISC-V Firmware WPRI Bit Manipulation Vulnerability

CVE-2026-29642 - XiangShan RISC-V Firmware WPRI Bit Manipulation Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Tue, 04/21/2026 - 01:54
CVE ID :CVE-2026-29642
Published : April 20, 2026, 9:16 p.m. | 56 minutes ago
Description :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.
Severity: 0.0 | NA
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