CVE-2022-23034
MEDIUMXen 3.2.0-4.12.x - Denial of Service via Grant Mapping Reference Count Underflow
Title source: llmDescription
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 (5)
Core 5
Core References
Patch, Vendor Advisory x_refsource_misc
https://xenbits.xenproject.org/xsa/advisory-394.txt
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
http://www.openwall.com/lists/oss-security/2022/01/25/3
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2022/dsa-5117
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202208-23
Scores
CVSS v3
5.5
EPSS
0.0010
EPSS Percentile
28.1%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-191
Status
published
Products (4)
debian/debian_linux
9.0
debian/debian_linux
11.0
fedoraproject/fedora
34
xen/xen
3.2.0 - 4.13.0
Published
Jan 25, 2022
Tracked Since
Feb 18, 2026