IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).
CVSS Details
- CVSS 3.1 Base Score: 6.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Mar 26, 2024 | Aug 27, 2021 |
| Debian | — | Upgrade xen | Nov 4, 2022 | Aug 27, 2021 |
| Gentoo Linux | — | Upgrade app-emulation/xen.Upgrade app-emulation/xen-tools. | Aug 16, 2022 | Aug 27, 2021 |
| Suse | — | Upgrade xenUpgrade xen-tools-domUUpgrade xen-tools-xendomains-wait-diskUpgrade xen-develUpgrade xen-doc-htmlUpgrade xen-libs-32bitUpgrade xen-libsUpgrade xen-tools | Sep 3, 2021 | Aug 27, 2021 |
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