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An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Mar 26, 2024 | Jul 7, 2020 |
| Debian | — | Upgrade xen | Jul 14, 2020 | Jul 7, 2020 |
| Gentoo Linux | — | Upgrade app-emulation/xen.Upgrade app-emulation/xen-tools. | Jul 28, 2020 | Jul 7, 2020 |
| Suse | — | Upgrade xen-tools-xendomains-wait-diskUpgrade xenUpgrade xen-tools-domUUpgrade xen-doc-htmlUpgrade xen-libsUpgrade xen-libs-32bitUpgrade xen-develUpgrade xen-tools | Jul 11, 2020 | Jul 7, 2020 |
| Ubuntu | — | Upgrade xenstore-utilsUpgrade xen-utils-commonUpgrade xen-hypervisor-4.11-amd64Upgrade xen-hypervisor-4.11-armhfUpgrade xen-hypervisor-4.11-arm64Upgrade libxendevicemodel1Upgrade libxengnttab1Upgrade libxenevtchn1Upgrade xen-utils-4.11Upgrade libxenmisc4.11 | Sep 20, 2022 | Jul 7, 2020 |
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