CVE-2026-29642_CVE-2026-29642

7.8 / 10

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Basic Information

ID CVE-2026-29642

Source mitre

Published Apr 20, 2026 at 00:00

Modified Apr 21, 2026 at 19:50

Affected Product

Vendor n/a

Product n/a

Version n/a

Affected Versions n/a n/a n/a

CWE Classification

CWE-1244

References

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    "published": "2026-04-20T00:00:00.000Z",
    "modified": "2026-04-21T19:50:54.758Z",
    "type": "cve",
    "title": "CVE-2026-29642",
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    "references": "https://github.com/OpenXiangShan/XiangShan/issues/3934\nhttps://github.com/OpenXiangShan/XiangShan/commit/5e3dd63\nhttps://docs.riscv.org/reference/isa/priv/priv-csrs.html\nhttps://docs.riscv.org/reference/isa/priv/machine.html",
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