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CVE-2022-23034

MEDIUM
5.5
CVSS Score
Published: January 25, 2022 at 01:43 PM UTC
Updated: June 17, 2026 at 04:29 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraXen

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
11.09.0
Fedora· Fedora Projectrpm
95%
34
Xen· Xenwordpress-plugin
95%
3.2.0 ≤ v < 4.13.0
Affected range stops below 4.13.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in consult Xen advisory XSA-394 (unknown)

References (5)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2022/01/25/3
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202208-23
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2022/dsa-5117
x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://xenbits.xenproject.org/xsa/advisory-394.txt

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-191

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