Is CVE-2026-29646 in the CISA KEV catalog?

No. CVE-2026-29646 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-29646?

CVE-2026-29646 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2026-29646?

CVE-2026-29646 has an EPSS score of 0.36% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-29646?

No published fix for CVE-2026-29646 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-29646

CRITICAL

9.8

CVSS v3

NVD

Description

In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.

CWE-267

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.36%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Other references7

Related Vulnerabilities

Other CWE-267 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-41244	High	7.8	7.9%	KEV	Fix
CVE-2024-42365	High	7.4	4.7%	-	Fix
CVE-2025-47811	Medium	4.1	3.5%	-	Fix
CVE-2020-29396	High	8.8	3.2%	-	-
CVE-2019-10169	Medium	6.6	1.3%	-	Fix
CVE-2019-10170	Medium	6.6	1.2%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-21.