Vulnerability identifier: #VU77522

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-42336

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote guest to perform a denial of service (DoS) attack.

The vulnerability exists due to integer overflow in SSBD imlementation. A remote guest can mislead other guests into observing SSBD active when it is not.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 4.17 - 4.17.1

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External links
http://xenbits.xenproject.org/xsa/advisory-431.txt
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LTO3U3WYLAZW3KLPKJZ332FYUREXPZMQ/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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