Vulnerabilities > CVE-2022-23034 - Integer Underflow (Wrap or Wraparound) vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
References
- https://xenbits.xenproject.org/xsa/advisory-394.txt
- http://www.openwall.com/lists/oss-security/2022/01/25/3
- https://www.debian.org/security/2022/dsa-5117
- https://security.gentoo.org/glsa/202208-23
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/