Description
An issue was discovered in Xen through 4.9.x allowing x86 HVM guest OS users to obtain sensitive information from the host OS (or an arbitrary guest OS) because intercepted I/O operations can cause a write of data from uninitialized hypervisor stack memory.
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 | 4.8.2+xsa245-0+deb9u1 | — |
| Debian 13 | xen | 4.8.2+xsa245-0+deb9u1 | — |
| Debian 12 | xen | 4.8.2+xsa245-0+deb9u1 | — |
| Debian 9 | xen | 4.8.2+xsa245-0+deb9u1 | DSA-4050-1 |
| Debian 8 | xen | 4.4.4lts2-0+deb8u1 | DLA-1549-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | xen | 4.1.6.lts1-10 | DLA-1181-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | xen | 4.9.2-0ubuntu1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | xen | 4.7.3_06-43.15.1 | SUSE-SU-2017:2864-1 |
| SLES 12 SP1 | xen | 4.5.5_18-22.31.1 | SUSE-SU-2017:2873-1 |
| SLES 12 | xen | 4.4.4_24-22.54.1 | SUSE-SU-2017:2856-1 |
| SLES 11 SP4 | xen | 4.4.4_24-61.12.1 | SUSE-SU-2017:2815-1 |
| SLES 11 SP3 | xen | 4.2.5_21-45.11.1 | SUSE-SU-2017:2812-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | xen | 4.7.3_06-43.15.1 | SUSE-SU-2017:2864-1 |
| SLES for SAP 12 SP1 | xen | 4.5.5_18-22.31.1 | SUSE-SU-2017:2873-1 |
| SLES for SAP 11 SP4 | xen | 4.4.4_24-61.12.1 | SUSE-SU-2017:2815-1 |
| SUSE OpenStack Cloud 6 | xen | 4.5.5_18-22.31.1 | SUSE-SU-2017:2873-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | xen | 4.2.5_21-45.11.1 | SUSE-SU-2017:2812-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.9.0-r6 | — |
| Alpine v3.23 | xen | 4.9.0-r6 | — |
| Alpine v3.22 | xen | 4.9.0-r6 | — |
| Alpine v3.21 | xen | 4.9.0-r6 | — |
| Alpine v3.20 | xen | 4.9.0-r6 | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.9.0-r6 | — |
| Alpine v3.18 | xen | 4.9.0-r6 | — |
| Alpine v3.17 | xen | 4.9.0-r6 | — |
| Alpine v3.16 | xen | 4.9.0-r6 | — |
| Alpine v3.15 | xen | 4.9.0-r6 | — |
| Alpine v3.14 | xen | 4.9.0-r6 | — |
| Alpine v3.13 | xen | 4.9.0-r6 | — |
| Alpine v3.12 | xen | 4.9.0-r6 | — |
| Alpine v3.11 | xen | 4.9.0-r6 | — |
| Alpine v3.10 | xen | 4.9.0-r6 | — |
| Alpine v3.9 | xen | 4.9.0-r6 | — |
| Alpine v3.8 | xen | 4.9.0-r6 | — |
| Alpine v3.7 | xen | 4.9.0-r6 | — |
| Alpine v3.6 | xen | 4.8.2-r3 | — |
| Alpine v3.5 | xen | 4.7.3-r3 | — |
| Alpine v3.4 | xen | 4.6.6-r2 | — |
Advisories 8
- DLA-1549-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4050-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1181-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2873-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2815-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2812-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2856-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2864-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
References
- [debian-lts-announce] 20171120 [SECURITY] [DLA 1181-1] xen security update mailing-list
- 101496 vdb-entry
- https://xenbits.xen.org/xsa/advisory-239.html
- DSA-4050 vendor-advisory
- https://support.citrix.com/article/CTX228867
- [debian-lts-announce] 20181018 [SECURITY] [DLA 1549-1] xen security update mailing-list
- GLSA-201801-14 vendor-advisory
- 1039568 vdb-entry