Gentoo Linux: CVE-2022-23034: Xen: Multiple Vulnerabilities
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.
Solution(s)
- gentoo-linux-upgrade-app-emulation-xen
- gentoo-linux-upgrade-app-emulation-xen-tools
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