CVE-2026-29642Public exploit

Processor-state corruption via improper menvcfg WPRI handling

Published Apr 20, 2026 · Updated Apr 20, 2026

State corruption in XiangShan commit aecf601e803bfd2371667a3fb60bfcd83c333027 allows local users to alter reserved status bits. The CSR logic lets crafted menvcfg reads or writes change WPRI fields in xstatus instead of preserving and ignoring those reserved values. Reachability requires M-mode CSR execution or firmware induced to perform it; published evidence establishes processor-state modification but no further consequence.

CVSS severity7.8
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

State corruption in XiangShan commit aecf601e803bfd2371667a3fb60bfcd83c333027 allows local users to alter reserved status bits. The CSR logic lets crafted menvcfg reads or writes change WPRI fields in xstatus instead of preserving and ignoring those reserved values. Reachability requires M-mode CSR execution or firmware induced to perform it; published evidence establishes processor-state modification but no further consequence.

The record

CVE
CVE-2026-29642
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1244, CAPEC-114
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1244Internal Asset Exposed to Unsafe Debug Access Level or State
CAPEC-114Authentication Abuse

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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