Description
An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.
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 | 4.14.0+80-gd101b417b7-1 | — |
| Debian 13 | xen | 4.14.0+80-gd101b417b7-1 | — |
| Debian 12 | xen | 4.14.0+80-gd101b417b7-1 | — |
| Debian 10 | xen | 4.11.4+99-g8bce4698f6-1 | DSA-4888-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | xen | No fix yet | — |
| Ubuntu 26.04 LTS | xen | No fix yet | — |
| Ubuntu 25.10 | xen | No fix yet | — |
| Ubuntu 24.04 LTS | xen | No fix yet | — |
| Ubuntu 22.04 LTS | xen | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | xen | No fix yet | — |
| Ubuntu 18.04 LTS | xen | No fix yet | — |
| Ubuntu 16.04 LTS | xen | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | xen | 4.11.4_16-2.51.1 | SUSE-SU-2021:1251-1 |
| SLES 12 SP3 | xen | 4.9.4_16-3.83.1 | SUSE-SU-2021:1252-1 |
| SLES 12 SP2 | xen | 4.7.6_14-43.76.1 | SUSE-SU-2021:1268-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | xen | 4.10.4_24-3.56.1 | SUSE-SU-2021:1250-1 |
| SLES for SAP 12 SP4 | xen | 4.11.4_16-2.51.1 | SUSE-SU-2021:1251-1 |
| SLES for SAP 12 SP3 | xen | 4.9.4_16-3.83.1 | SUSE-SU-2021:1252-1 |
| SLE HPC 15 | xen | 4.10.4_24-3.56.1 | SUSE-SU-2021:1250-1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_16-2.51.1 | SUSE-SU-2021:1251-1 |
| SUSE OpenStack Cloud Crowbar 8 | xen | 4.9.4_16-3.83.1 | SUSE-SU-2021:1252-1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_16-2.51.1 | SUSE-SU-2021:1251-1 |
| SUSE OpenStack Cloud 8 | xen | 4.9.4_16-3.83.1 | SUSE-SU-2021:1252-1 |
| SUSE OpenStack Cloud 7 | xen | 4.7.6_14-43.76.1 | SUSE-SU-2021:1268-1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_16-3.83.1 | SUSE-SU-2021:1252-1 |
Advisories 5
- DSA-4888-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:1268-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1250-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1251-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1252-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026