Total vulnerabilities in the database
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.
| Software | From | Fixed in |
|---|---|---|
| xen / xen | 3.2.0 | 4.13.0 |
| fedoraproject / fedora | 34 | 34.x |
| debian / debian_linux | 9.0 | 9.0.x |
| debian / debian_linux | 11.0 | 11.0.x |