Description
Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.
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 | 4.8.0~rc3-1 | — |
| Debian 13 | xen | 4.8.0~rc3-1 | — |
| Debian 12 | xen | 4.8.0~rc3-1 | — |
| Debian 8 | xen | 4.4.1-9+deb8u8 | DSA-3729-1 |
| Debian 7 | xen | 4.1.6.lts1-3 | DLA-699-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | xen | 4.6.0-1ubuntu4.2 | — |
| Ubuntu 14.04 LTS | xen | 4.4.2-0ubuntu0.14.04.7 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | xen | 4.7.1_02-25.1 | SUSE-SU-2016:3067-1 |
| SLES 12 SP1 | xen | 4.5.5_02-22.3.1 | SUSE-SU-2016:3083-1 |
| SLES 12 | xen | 4.4.4_05-22.25.1 | SUSE-SU-2016:3156-1 |
| SLES 11 SP4 | xen | 4.4.4_10-43.5 | SUSE-SU-2016:3174-1 |
| SLES 11 SP3 | xen | 4.2.5_21-30.1 | SUSE-SU-2016:3273-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP2 | xen | 4.1.6_08-32.1 | SUSE-SU-2016:3044-1 |
| SLES for SAP 12 SP2 | xen | 4.7.1_02-25.1 | SUSE-SU-2016:3067-1 |
| SLES for SAP 12 SP1 | xen | 4.5.5_02-22.3.1 | SUSE-SU-2016:3083-1 |
| SLES for SAP 12 | xen | 4.4.4_05-22.25.1 | SUSE-SU-2016:3156-1 |
| SLES for SAP 11 SP4 | xen | 4.4.4_10-43.5 | SUSE-SU-2016:3174-1 |
| SUSE OpenStack Cloud 5 | xen | 4.2.5_21-30.1 | SUSE-SU-2016:3273-1 |
| SUSE Manager Proxy 2.1 | xen | 4.2.5_21-30.1 | SUSE-SU-2016:3273-1 |
| SUSE Manager 2.1 | xen | 4.2.5_21-30.1 | SUSE-SU-2016:3273-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | xen | 4.2.5_21-30.1 | SUSE-SU-2016:3273-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.15.1_01-1.2 | openSUSE-SU-2024:11520-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.7.0-r5 | — |
| Alpine v3.23 | xen | 4.7.0-r5 | — |
| Alpine v3.22 | xen | 4.7.0-r5 | — |
| Alpine v3.21 | xen | 4.7.0-r5 | — |
| Alpine v3.20 | xen | 4.7.0-r5 | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.7.0-r5 | — |
| Alpine v3.18 | xen | 4.7.0-r5 | — |
| Alpine v3.17 | xen | 4.7.0-r5 | — |
| Alpine v3.16 | xen | 4.7.0-r5 | — |
| Alpine v3.15 | xen | 4.7.0-r5 | — |
| Alpine v3.14 | xen | 4.7.0-r5 | — |
| Alpine v3.13 | xen | 4.7.0-r5 | — |
| Alpine v3.12 | xen | 4.7.0-r5 | — |
| Alpine v3.11 | xen | 4.7.0-r5 | — |
| Alpine v3.10 | xen | 4.7.0-r5 | — |
| Alpine v3.9 | xen | 4.7.0-r5 | — |
| Alpine v3.8 | xen | 4.7.0-r5 | — |
| Alpine v3.7 | xen | 4.7.0-r5 | — |
| Alpine v3.6 | xen | 4.7.0-r5 | — |
| Alpine v3.5 | xen | 4.7.0-r5 | — |
| Alpine v3.4 | xen | 4.6.3-r3 | — |
Advisories 9
- DLA-699-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3729-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:3044-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3067-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3174-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3156-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3273-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11520-1 xen-4.15.1_01-1.2 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2016:3083-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
References
- https://support.citrix.com/article/CTX217363
- http://xenbits.xen.org/xsa/advisory-190.html
- 93344 vdb-entry
- GLSA-201611-09 vendor-advisory
- 1036942 vdb-entry