Description
The compatibility mode hypercall argument translation in Xen 3.3.x through 4.4.x, when running on a 64-bit hypervisor, allows local 32-bit HVM guests to cause a denial of service (host crash) via vectors involving altering the high halves of registers while in 64-bit mode.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xen | 4.4.1-5 | — |
| Debian 13 | xen | 4.4.1-5 | — |
| Debian 12 | xen | 4.4.1-5 | — |
| Debian 7 | xen | 4.1.4-3+deb7u4 | DSA-3140-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xen | 4.4.1-0ubuntu0.14.04.2 | — |
Advisories 1
- DSA-3140-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- GLSA-201504-04 vendor-advisory
- 62672 third-party-advisory
- http://support.citrix.com/article/CTX201794
- http://support.citrix.com/article/CTX200288
- http://xenbits.xen.org/xsa/advisory-111.html
- DSA-3140 vendor-advisory
- openSUSE-SU-2015:0226 vendor-advisory
- openSUSE-SU-2015:0256 vendor-advisory
- 71332 vdb-entry
- 59937 third-party-advisory