The Quarterly Threat Landscape Report is out. See what attackers are targeting now.Read report
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-tools.Upgrade app-emulation/xen. | Jul 28, 2020 | Jul 7, 2020 |
| Suse | — | Upgrade xen-doc-htmlUpgrade xen-tools-xendomains-wait-diskUpgrade xen-tools-domUUpgrade xenUpgrade xen-libsUpgrade xen-libs-32bitUpgrade xen-toolsUpgrade xen-devel | Jul 11, 2020 | Jul 7, 2020 |
| Ubuntu | — | Upgrade libxenmisc4.11Upgrade libxendevicemodel1Upgrade libxenevtchn1Upgrade libxengnttab1Upgrade xen-utils-4.11Upgrade xen-hypervisor-4.11-armhfUpgrade xen-hypervisor-4.11-amd64Upgrade xenstore-utilsUpgrade xen-hypervisor-4.11-arm64Upgrade xen-utils-common | Sep 20, 2022 | Jul 7, 2020 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub