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CVE-2026-29642
HIGH7.8
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.
CVE Details
CVSS v3.1 Score7.8
SeverityHIGH
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorLOCAL
ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
Published4/20/2026
Last Modified4/21/2026
Sourcenvd
Honeypot Sightings0
Weaknesses (CWE)
CWE-1244
References
https://docs.riscv.org/reference/isa/priv/machine.html(cve@mitre.org)
https://docs.riscv.org/reference/isa/priv/priv-csrs.html(cve@mitre.org)
https://github.com/OpenXiangShan/XiangShan/commit/5e3dd63(cve@mitre.org)
https://github.com/OpenXiangShan/XiangShan/issues/3934(cve@mitre.org)
IOC Correlations
No correlations recorded
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