CVE-2022-23034

medium

Description

A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled. PV guests can request two forms of mappings. When both are in use for any individual mapping, unmapping of such a mapping can be requested in two steps. The reference count for such a mapping would then mistakenly be decremented twice. Underflow of the counters gets detected, resulting in the triggering of a hypervisor bug check.

References

https://xenbits.xenproject.org/xsa/advisory-394.txt

http://www.openwall.com/lists/oss-security/2022/01/25/3

https://lists.fedoraproject.org/archives/list/[email protected]/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/

https://www.debian.org/security/2022/dsa-5117

https://security.gentoo.org/glsa/202208-23

Details

Source: MITRE

Published: 2022-01-25

Updated: 2022-08-19

Type: CWE-191

Risk Information

CVSS v2

Base Score: 2.1

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM