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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Mar 26, 2024 | Jan 25, 2022 |
| Debian | — | Upgrade xen | Nov 4, 2022 | Jan 25, 2022 |
| Gentoo Linux | — | Upgrade app-emulation/xen.Upgrade app-emulation/xen-tools. | Aug 16, 2022 | Jan 25, 2022 |
| Suse | — | Upgrade xenUpgrade xen-libs-32bitUpgrade xen-libsUpgrade xen-toolsUpgrade xen-kmp-defaultUpgrade xen-tools-xendomains-wait-diskUpgrade xen-kmp-paeUpgrade xen-develUpgrade xen-tools-domUUpgrade xen-doc-html | Feb 5, 2022 | Jan 25, 2022 |
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