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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | alpine-linux-upgrade-xen | Mar 26, 2024 | Jan 25, 2022 | |
| Debian | debian-upgrade-xen | Nov 4, 2022 | Jan 25, 2022 | |
| Gentoo Linux | gentoo-linux-upgrade-app-emulation-xengentoo-linux-upgrade-app-emulation-xen-tools | Aug 16, 2022 | Jan 25, 2022 | |
| Suse | — | suse-upgrade-xensuse-upgrade-xen-develsuse-upgrade-xen-doc-htmlsuse-upgrade-xen-kmp-defaultsuse-upgrade-xen-kmp-paesuse-upgrade-xen-libssuse-upgrade-xen-libs-32bitsuse-upgrade-xen-toolssuse-upgrade-xen-tools-domususe-upgrade-xen-tools-xendomains-wait-disk | Feb 5, 2022 | Jan 25, 2022 |
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