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Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Aug 30, 2017 | Aug 2, 2016 |
| Debian | — | Upgrade xen | Jul 30, 2024 | Aug 2, 2016 |
| Freebsd | — | Upgrade xen-kernel | Dec 10, 2025 | Aug 2, 2016 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jul 26, 2016 |
| Suse | — | Upgrade xen-tools-xendomains-wait-diskUpgrade xen-toolsUpgrade xen-develUpgrade xen-tools-domUUpgrade xen-libsUpgrade xen-libs-32bitUpgrade xen-kmp-defaultUpgrade xenUpgrade xen-doc-html | Aug 22, 2016 | Aug 2, 2016 |
| Ubuntu | — | Upgrade xen | Nov 19, 2024 | Aug 2, 2016 |
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