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CVE-2022-23034

Date: January 25, 2022

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.

Severity Score

Related Resources (9)

http://www.openwall.com/lists/oss-security/2022/01/25/3
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
https://security-tracker.debian.org/tracker/CVE-2022-23034
https://www.debian.org/security/2022/dsa-5117
https://xenbits.xenproject.org/xsa/advisory-394.txt
https://security.gentoo.org/glsa/202208-23
https://security.alpinelinux.org/vuln/CVE-2022-23034
https://nvd.nist.gov/vuln/detail/CVE-2022-23034
https://www.mend.io/vulnerability-database/CVE-2022-23034

Severity Score

Weakness Type (CWE)

Integer Underflow (Wrap or Wraparound)

CWE-191

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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