#VU63438 Race condition in Xen - CVE-2022-26357

Vulnerability identifier: #VU63438

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-26357

CWE-ID: CWE-362

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition in the VT-d domain ID cleanup. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 4.11.0 - 4.16.0

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External links
https://xenbits.xenproject.org/xsa/advisory-399.txt
https://xenbits.xen.org/xsa/advisory-399.html
https://www.openwall.com/lists/oss-security/2022/04/05/2
https://www.debian.org/security/2022/dsa-5117
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UHFSRVLM2JUCPDC2KGB7ETPQYJLCGBLD/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6ETPM2OVZZ6KOS2L7QO7SIW6XWT5OW3F/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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