CVE-2022-34634Public exploit

Execution disruption via malformed DRET acceptance

Published Jul 18, 2022 · Updated Aug 3, 2024

Improper exception handling in CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a allows local users to disrupt execution. The decoder overwrites the existing illegal-instruction result while checking Debug Mode, so a DRET encoding with a nonzero rd field executes instead of trapping. Reachability requires local code execution in Debug Mode; the demonstrated outcome is divergent control flow rather than an illegal-instruction trap.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exception handling in CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a allows local users to disrupt execution. The decoder overwrites the existing illegal-instruction result while checking Debug Mode, so a DRET encoding with a nonzero rd field executes instead of trapping. Reachability requires local code execution in Debug Mode; the demonstrated outcome is divergent control flow rather than an illegal-instruction trap.

The record

CVE
CVE-2022-34634
Published
Jul 18, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-755
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions

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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