Vulnerability identifier: #VU63798

Vulnerability risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-23034

CWE-ID: CWE-191

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local user can perform a denial of service attack.

The vulnerability exists due to integer underflow when unmapping a grant to address XSA-380. A local user can request two forms of mappings to perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 2.0 - 4.14.3

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External links
http://xenbits.xenproject.org/xsa/advisory-394.txt
http://www.openwall.com/lists/oss-security/2022/01/25/3
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
http://bugzilla.redhat.com/show_bug.cgi?id=2045041

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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.