Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xenUpgrade linux-vanilla.Upgrade linux-grsecUpgrade qemu | Aug 30, 2017 | Dec 17, 2015 |
| Debian | — | Upgrade xen | Mar 22, 2016 | Mar 17, 2016 |
| Freebsd | — | Upgrade xen-kernel | Dec 10, 2025 | Jan 6, 2016 |
| Gentoo Linux | — | Upgrade app-emulation/xen.Upgrade app-emulation/pvgrub.Upgrade app-emulation/xen-tools.Upgrade app-emulation/xen-pvgrub. | Oct 30, 2017 | Apr 13, 2016 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Dec 17, 2015 |
| Suse | — | Upgrade xenUpgrade xen-kmp-traceUpgrade xen-libs-32bitUpgrade xen-tools-domUUpgrade xen-kmp-defaultUpgrade xen-kmp-paeUpgrade xen-doc-pdfUpgrade xen-toolsUpgrade xen-tools-xendomains-wait-diskUpgrade xen-doc-htmlUpgrade xen-libsUpgrade xen-devel | Mar 17, 2016 | Mar 4, 2016 |
| Ubuntu | — | Upgrade xen | Nov 19, 2024 | Apr 13, 2016 |
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