Description
The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 3.3.x through 4.4.x does not check the supervisor mode permissions for instructions that generate software interrupts, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors.
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 | 4.4.1-3 | — |
| Debian 13 | xen | 4.4.1-3 | — |
| Debian 12 | xen | 4.4.1-3 | — |
| Debian 7 | xen | 4.1.4-3+deb7u3 | DSA-3041-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xen | 4.4.0-0ubuntu5.2 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.7.0_12-1.3 | openSUSE-SU-2024:10196-1 |
Advisories 2
- DSA-3041-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10196-1 xen-4.7.0_12-1.3 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- openSUSE-SU-2014:1281 vendor-advisory
- FEDORA-2014-12000 vendor-advisory
- http://xenbits.xen.org/xsa/advisory-106.html
- openSUSE-SU-2014:1279 vendor-advisory
- http://support.citrix.com/article/CTX200218
- 70062 vdb-entry
- FEDORA-2014-12036 vendor-advisory
- 1030889 vdb-entry
- DSA-3041 vendor-advisory
- 61858 third-party-advisory
- 61890 third-party-advisory
- 61500 third-party-advisory
- GLSA-201412-42 vendor-advisory