The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels.
However dom_io being a PV domain gets the AMD-Vi IOMMU page tables levels based on the maximum (hot pluggable) RAM address, and hence on systems with no RAM above the 512GB mark only 3 page-table levels are configured in the IOMMU.
On systems without RAM above the 512GB boundary amd_iommu_quarantine_init() will setup page tables for the scratch page with 4 levels, while the IOMMU will be configured to use 3 levels only, resulting in the last page table directory (PDE) effectively becoming a page table entry (PTE), and hence a device in quarantine mode gaining write access to the page destined to be a PDE.
Due to this page table level mismatch, the sink page the device gets read/write access to is no longer cleared between device assignment, possibly leading to data leaks.
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:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Mar 26, 2024 | Jan 5, 2024 |
| Debian | — | Upgrade xen | Jul 30, 2024 | Jan 5, 2024 |
| Dell Powerstore Dsa2024158 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Apr 4, 2024 |
| Dell Powerstore Dsa2024225 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | May 29, 2024 |
| Gentoo Linux | — | Upgrade app-emulation/xen. | Sep 23, 2024 | Jan 5, 2024 |
| Suse | — | Upgrade xen-libs-32bitUpgrade xen-libsUpgrade xen-tools-domuUpgrade xenUpgrade xen-toolsUpgrade xen-develUpgrade xen-doc-htmlUpgrade xen-tools-xendomains-wait-disk | Nov 17, 2023 | Nov 16, 2023 |
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