What is the severity of CVE-2023-46836?

The severity of CVE-2023-46836 is not explicitly rated but involves vulnerabilities affecting IRQ safety.

How do I fix CVE-2023-46836?

To fix CVE-2023-46836, apply the latest updates provided by the Xen project that address the IRQ safety issues.

Which versions of Xen are affected by CVE-2023-46836?

CVS-2023-46836 affects the Xen unstable version as per the details available.

What are the risks associated with CVE-2023-46836?

The risks associated with CVE-2023-46836 include potential exposure to branch type confusion and speculative execution attacks.

Is CVE-2023-46836 a critical vulnerability?

While CVE-2023-46836 is serious, its criticality depends on the context of use and specific deployment configurations.

Vulnerability/
CVE-2023-46836

medium

4.7

14/11/2023

5/1/2024

2/8/2024

CVE-2023-46836: x86: BTC/SRSO fixes not fully effective

First published: Tue Nov 14 2023(Updated: )

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.

Credit: security@xen.org

Affected Software	Affected Version	How to fix
Xen XAPI

Remedy

https://xenbits.xenproject.org/xsa/advisory-446.html

Never miss a vulnerability like this again

Reference Links

https://xenbits.xenproject.org/xsa/advisory-446.html

Frequently Asked Questions

What is the severity of CVE-2023-46836?
The severity of CVE-2023-46836 is not explicitly rated but involves vulnerabilities affecting IRQ safety.
How do I fix CVE-2023-46836?
To fix CVE-2023-46836, apply the latest updates provided by the Xen project that address the IRQ safety issues.
Which versions of Xen are affected by CVE-2023-46836?
CVS-2023-46836 affects the Xen unstable version as per the details available.
What are the risks associated with CVE-2023-46836?
The risks associated with CVE-2023-46836 include potential exposure to branch type confusion and speculative execution attacks.
Is CVE-2023-46836 a critical vulnerability?
While CVE-2023-46836 is serious, its criticality depends on the context of use and specific deployment configurations.

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alias/CVE-2023-46836
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collector/nvd-api
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canonical/xen xapi

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