Description
Use-after-free vulnerability in the FIFO event channel code in Xen 4.4.x allows local guest OS administrators to cause a denial of service (host crash) and possibly execute arbitrary code or obtain sensitive information via an invalid guest frame number.
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 | 4.6.0-1 | — |
| Debian 13 | xen | 4.6.0-1 | — |
| Debian 12 | xen | 4.6.0-1 | — |
| Debian 8 | xen | 4.4.1-9+deb8u7 | DSA-3663-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xen | 4.4.2-0ubuntu0.14.04.7 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | xen | 4.4.4_04-22.22.2 | SUSE-SU-2016:2533-1 |
| SLES 11 SP4 | xen | 4.4.4_08-40.2 | SUSE-SU-2016:2507-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | xen | 4.4.4_04-22.22.2 | SUSE-SU-2016:2533-1 |
| SLES for SAP 11 SP4 | xen | 4.4.4_08-40.2 | SUSE-SU-2016:2507-1 |
Advisories 3
- DSA-3663-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:2507-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2533-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- 92863 vdb-entry
- http://xenbits.xen.org/xsa/advisory-188.html
- DSA-3663 vendor-advisory
- http://xenbits.xen.org/xsa/xsa188.patch
- http://www.c7zero.info/stuff/csw2017_ExploringYourSystemDeeper_updated.pdf
- http://support.citrix.com/article/CTX216071
- 1036754 vdb-entry