Description
The x86 emulator in Xen 3.2.x through 4.5.x does not properly ignore segment overrides for instructions with register operands, which allows local guest users to obtain sensitive information, cause a denial of service (memory corruption), or possibly execute arbitrary code 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 | 4.4.1-8 | — |
| Debian 13 | xen | 4.4.1-8 | — |
| Debian 12 | xen | 4.4.1-8 | — |
| Debian 7 | xen | 4.1.4-3+deb7u5 | DSA-3181-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xen | 4.4.1-0ubuntu0.14.04.4 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +12 | 2.6.18-409.el5 | RHSA-2016:0450 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | xen | 4.4.1_10-9.1 | SUSE-SU-2015:0613-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | xen | 4.4.1_10-9.1 | SUSE-SU-2015:0613-1 |
Advisories 3
- RHSA-2016:0450 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-3181-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:0613-1 Security update for Xen SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-423503.htm
- http://support.citrix.com/article/CTX200484
- FEDORA-2015-3944 vendor-advisory
- FEDORA-2015-3721 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://xenbits.xen.org/xsa/advisory-123.html
- 1031903 vdb-entry
- DSA-3181 vendor-advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
- FEDORA-2015-3935 vendor-advisory
- openSUSE-SU-2015:0732 vendor-advisory
- GLSA-201604-03 vendor-advisory
- 73015 vdb-entry
- 1031806 vdb-entry