Is CVE-2023-46836 in the CISA KEV catalog?

No. CVE-2023-46836 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-46836?

CVE-2023-46836 has a CVSS v3 base score of 4.7 (MEDIUM).

What is the EPSS score for CVE-2023-46836?

CVE-2023-46836 has an EPSS score of 0.25% (16th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-46836?

Upgrade xen on debian 12 to 4.17.2+76-ge1f9cb16e2-1~deb12u1 or later.

CVE & CISA-KEV Catalog

CVE-2023-46836

MEDIUM

4.7

CVSS v3

NVD

Description

The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown (XPTI) deliberately left interrupts enabled on two entry paths; one unconditionally, and one conditionally on whether XPTI was active. As BTC/SRSO and Meltdown affect different CPU vendors, the mitigations are not active together by default. Therefore, there is a race condition whereby a malicious PV guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen.

How to fix

Remediation Available

xenDebian

Fixed in:4.17.2+76-ge1f9cb16e2-1~deb12u1CVE-2023-46836

Fixed in:4.17.2+76-ge1f9cb16e2-1CVE-2023-46836

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.25%probability of exploitation in 30 days

16thpercentile

Low risk: more likely to be exploited than 16% of all known CVEs.

References

Patch1

xenbits.xenproject.org

Other references1

xenbits.xen.org

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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 2025-11-04.