What’s Vulnerable › Vulnerabilities

CVE-2022-23034

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-25 · updated 2026-06-17
• Weakness: CWE-191

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 products

• Debian Linux: 9.0, 11.0
• Fedoraproject Fedora: 34
• xen: from 3.2.0 before 4.13.0 — fixed in 4.13.0

How to fix

Upgrade to a fixed version: xen 4.13.0. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2022/01/25/3
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
• https://security.gentoo.org/glsa/202208-23
• https://www.debian.org/security/2022/dsa-5117
• 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/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
• https://security.gentoo.org/glsa/202208-23
• https://www.debian.org/security/2022/dsa-5117
• https://xenbits.xenproject.org/xsa/advisory-394.txt

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