CVE-2021-27379
Fixed in a distro release EPSS <1%
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.
Products: xen, debian_linux
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 10 | xen | 4.11.4+99-g8bce4698f6-1 |
| Debian 12 | xen | 4.14.0+80-gd101b417b7-1 |
| Debian 13 | xen | 4.14.0+80-gd101b417b7-1 |
| Debian 14 | xen | 4.14.0+80-gd101b417b7-1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_16-3.83.1 |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | xen | 4.10.4_24-3.56.1 |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | xen | 4.10.4_24-3.56.1 |
| SUSE Linux Enterprise Server 12 SP2-BCL | xen | 4.7.6_14-43.76.1 |
| SUSE Linux Enterprise Server 12 SP3-BCL | xen | 4.9.4_16-3.83.1 |
| SUSE Linux Enterprise Server 12 SP3-LTSS | xen | 4.9.4_16-3.83.1 |
| SUSE Linux Enterprise Server 12 SP4-LTSS | xen | 4.11.4_16-2.51.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | xen | 4.9.4_16-3.83.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | xen | 4.11.4_16-2.51.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 | xen | 4.10.4_24-3.56.1 |
| SUSE OpenStack Cloud 7 | xen | 4.7.6_14-43.76.1 |
| SUSE OpenStack Cloud 8 | xen | 4.9.4_16-3.83.1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_16-2.51.1 |
| SUSE OpenStack Cloud Crowbar 8 | xen | 4.9.4_16-3.83.1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_16-2.51.1 |
| Ubuntu 16.04 LTS | xen | no fix |
| Ubuntu 18.04 LTS | xen | no fix |
| Ubuntu 20.04 LTS | xen | no fix |
| Ubuntu 22.04 LTS | xen | no fix |
| Ubuntu 24.04 LTS | xen | no fix |
| Ubuntu 25.10 | xen | no fix |
| Ubuntu 26.04 LTS | xen | no fix |
| Ubuntu 26.10 | xen | no fix |