Vulnerability identifier: #VU83163

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-46836

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote guest to bypass implemented security restrictions.

The vulnerability exists due to improper implementation of mitigations against BTC/SRSO. A malicious guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen, which can result in memory access to other guests.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: All versions

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External links
http://xenbits.xen.org/xsa/advisory-446.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.