CVE-2026-29642

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.

Is your site exposed to CVE-2026-29642?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.8

HIGH

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

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-1244 CWE-1244

References

Other References

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-29642? +

CVE-2026-29642 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-29642? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-36755

The CleverDisplay BlueOne hardware player is designed with its USB interfaces physically enclosed and inaccessible under normal operating conditions. Researchers …

CVE-2025-42878 8.2

SAP Web Dispatcher and ICM may expose internal testing interfaces that are not intended for production. If enabled, unauthenticated attackers …

CVE-2024-0114 8.1

NVIDIA Hopper HGX for 8-GPU contains a vulnerability in the HGX Management Controller (HMC) that may allow a malicious actor …

CVE-2025-23337 6.7

NVIDIA HGX & DGX GB200, GB300, B300 contain a vulnerability in the HGX Management Controller (HMC) that may allow a …

CVE-2025-67862 6.7

An Internal Asset Exposed to Unsafe Debug Access Level or State vulnerability [CWE-1244] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.2, …

CVE-2025-20238 6.0

A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could …