Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Xen | xen | 4.12.x – < unspecified | unspecified |
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 | 4.14.3+32-g9de3671772-1 | — |
| Debian 13 | xen | 4.14.3+32-g9de3671772-1 | — |
| Debian 12 | xen | 4.14.3+32-g9de3671772-1 | — |
| Debian 11 | xen | 4.14.3+32-g9de3671772-1~deb11u1 | DSA-5017-1 |
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 15 SP3 | xen | 4.14.3_04-3.15.1 | SUSE-SU-2021:3968-1 |
| SLES 15 SP2 | xen | 4.13.4_02-3.40.1 | SUSE-SU-2021:3888-1 |
| SLES 15 SP1 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
| SLES 12 SP5 | xen | 4.12.4_16-3.55.1 | SUSE-SU-2021:3852-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
| SLES for SAP 12 SP5 | xen | 4.12.4_16-3.55.1 | SUSE-SU-2021:3852-1 |
| SLE Micro 5.1 | xen | 4.14.3_04-3.15.1 | SUSE-SU-2021:3968-1 |
| SLE Micro 5.0 | xen | 4.13.4_02-3.40.1 | SUSE-SU-2021:3888-1 |
| SLE HPC 15 SP1 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
| SUSE Enterprise Storage 6 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.16.0_01-1.1 | openSUSE-SU-2024:11624-1 |
| openSUSE Leap 15.3 | xen | 4.14.3_04-3.15.1 | openSUSE-SU-2021:3968-1 |
| openSUSE Leap 15.2 | xen | 4.13.4_02-lp152.2.33.1 | openSUSE-SU-2021:1543-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.15.1-r1 | — |
| Alpine v3.23 | xen | 4.15.1-r1 | — |
| Alpine v3.22 | xen | 4.15.1-r1 | — |
| Alpine v3.21 | xen | 4.15.1-r1 | — |
| Alpine v3.20 | xen | 4.15.1-r1 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.15.1-r1 | — |
| Alpine v3.18 | xen | 4.15.1-r1 | — |
| Alpine v3.17 | xen | 4.15.1-r1 | — |
| Alpine v3.16 | xen | 4.15.1-r1 | — |
| Alpine v3.15 | xen | 4.15.1-r1 | — |
| Alpine v3.14 | xen | 4.15.1-r1 | — |
| Alpine v3.13 | xen | 4.14.3-r1 | — |
| Alpine v3.12 | xen | 4.13.4-r1 | — |
| Alpine v3.11 | xen | 4.13.4-r1 | — |
Advisories 8
- DSA-5017-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:3968-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3888-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3968-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1543-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11624-1 xen-4.16.0_01-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3977-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3852-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://xenbits.xenproject.org/xsa/advisory-386.txt
- [oss-security] 20211007 Xen Security Advisory 386 v2 (CVE-2021-28702) - PCI devices with RMRRs not deassigned correctly mailing-list
- FEDORA-2021-80bbe7def0 vendor-advisory
- FEDORA-2021-0b7a484688 vendor-advisory
- FEDORA-2021-829f5f2f43 vendor-advisory
- DSA-5017 vendor-advisory
- GLSA-202208-23 vendor-advisory