CVE-2022-23034

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.

• CWE-191

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

Published

Jan 25, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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