CVE-2022-23034

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.

References

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/[email protected]/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/

https://www.debian.org/security/2022/dsa-5117

https://security.gentoo.org/glsa/202208-23

Details

Risk Information

CVSS v2

CVSS v3