CVE-2021-28702
Fixed in a distro release EPSS <1%
PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.11 | xen | 4.13.4-r1 |
| Alpine 3.12 | xen | 4.13.4-r1 |
| Alpine 3.13 | xen | 4.14.3-r1 |
| Alpine 3.14 | xen | 4.15.1-r1 |
| Alpine 3.15 | xen | 4.15.1-r1 |
| Alpine 3.16 | xen | 4.15.1-r1 |
| Alpine 3.17 | xen | 4.15.1-r1 |
| Alpine 3.18 | xen | 4.15.1-r1 |
| Alpine 3.19 | xen | 4.15.1-r1 |
| Alpine 3.20 | xen | 4.15.1-r1 |
| Alpine 3.21 | xen | 4.15.1-r1 |
| Alpine 3.22 | xen | 4.15.1-r1 |
| Alpine 3.23 | xen | 4.15.1-r1 |
| Alpine 3.24 | xen | 4.15.1-r1 |
| Debian 11 | xen | 4.14.3+32-g9de3671772-1~deb11u1 |
| Debian 12 | xen | 4.14.3+32-g9de3671772-1 |
| Debian 13 | xen | 4.14.3+32-g9de3671772-1 |
| Debian 14 | xen | 4.14.3+32-g9de3671772-1 |
| SUSE Enterprise Storage 6 | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise Micro 5.0 | xen | 4.13.4_02-3.40.1 |
| SUSE Linux Enterprise Micro 5.1 | xen | 4.14.3_04-3.15.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | xen | 4.13.4_02-3.40.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | xen | 4.14.3_04-3.15.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | xen | 4.13.4_02-3.40.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | xen | 4.14.3_04-3.15.1 |
| SUSE Linux Enterprise Server 12 SP5 | xen | 4.12.4_16-3.55.1 |
| SUSE Linux Enterprise Server 15 SP1-BCL | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise Server 15 SP1-LTSS | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | xen | 4.12.4_16-3.55.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | xen | 4.12.4_16-3.55.1 |
| 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 |
| openSUSE Leap 15.2 | xen | 4.13.4_02-lp152.2.33.1 |
| openSUSE Leap 15.3 | xen | 4.14.3_04-3.15.1 |
| openSUSE Tumbleweed | xen | 4.16.0_01-1.1 |