xen: A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mapp...
CVE-2022-23034 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-23034, released January 25, 2022. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.16.0+51-g0941d6cb-1 | DEBIAN-CVE-2022-23034 | Jan 25, 2022 |
| xen · Debian 13.5 (trixie) | 4.16.0+51-g0941d6cb-1 | DEBIAN-CVE-2022-23034 | Jan 25, 2022 |
| xen · Debian 14 | 4.16.0+51-g0941d6cb-1 | DEBIAN-CVE-2022-23034 | Jan 25, 2022 |
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