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CVE-2022-34639· NVD / CVE Program· CNA mitre

CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a treats non-standard fence instructions as illegal which can affect the function of the

CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a treats non-standard fence instructions as illegal which can affect the function of the application.

MediumCVSS 5.5 · v3.1—No exploit No fix recorded

Noroxi analysis

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Published
Jul 18, 2022
Updated
Jun 17, 2026
EPSS
0.2% · 14th percentile
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Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Affected systems

VendorProduct
openhwgroupcva6

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • openhwgroup cva6all versions

Same product

openhwgroup: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-34635The mstatus.sd field in CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a does not update when the mstatus.fs field is set to Dirty.
    39Monitor
  • CVE-2022-33023CVA6 commit 909d85a gives incorrect permission to use special multiplication units when the format of instructions is wrong.
    30Monitor
  • CVE-2022-33021CVA6 commit 909d85a accesses invalid memory when reading the value of MHPMCOUNTER30.
    30Monitor
  • CVE-2022-34640The *tval of ecall/ebreak in CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a was discovered to be incorrect.
    22Monitor
  • CVE-2022-34637CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a implements an incorrect exception type when an illegal virtual address is loaded.
    22Monitor
  • CVE-2022-34636CVA6 commit d315ddd0f1be27c1b3f27eb0b8daf471a952299a and RISCV-Boom commit ad64c5419151e5e886daee7084d8399713b46b4b implements the incorrect
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-755 · Improper Handling of Exceptional Conditions

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records