Description
inappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, asynchronous notification of the completion of such commands is not used. Instead, the issuing CPU spin-waits for the completion of the most recently issued command(s). Some of these waiting loops try to apply a timeout to fail overly-slow commands. The course of action upon a perceived timeout actually being detected is inappropriate: - on Intel hardware guests which did not originally cause the timeout may be marked as crashed, - on AMD hardware higher layer callers would not be notified of the issue, making them continue as if the IOMMU operation succeeded.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Xen | xen | 4.13.x, 4.14.x, 4.15.x, xen-unstable, 4.12.x, 4.11.x | — |
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 | 4.14.2+25-gb6a8c4f72d-1 | — |
| Debian 13 | xen | 4.14.2+25-gb6a8c4f72d-1 | — |
| Debian 12 | xen | 4.14.2+25-gb6a8c4f72d-1 | — |
| Debian 10 | xen | 4.11.4+107-gef32c7afa2-1 | DSA-4931-1 |
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 | 4.14.2_04-3.9.1 | SUSE-SU-2021:2923-1 |
| SLES 15 SP2 | xen | 4.13.3_02-3.34.1 | SUSE-SU-2021:2922-1 |
| SLES 15 SP1 | xen | 4.12.4_12-3.52.1 | SUSE-SU-2021:2925-1 |
| SLES 12 SP5 | xen | 4.12.4_12-3.49.1 | SUSE-SU-2021:2924-1 |
| SLES 12 SP4 | xen | 4.11.4_20-2.60.1 | SUSE-SU-2021:2955-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | xen | 4.9.4_20-3.91.1 | SUSE-SU-2021:2957-1 |
| SLES 12 SP2 | xen | 4.7.6_16-43.79.5 | SUSE-SU-2021:3322-1 |
| SLES 11 SP4 | xen | 4.4.4_50-61.67.1 | SUSE-SU-2021:14848-1 |
| SLES for SAP 15 SP1 | xen | 4.12.4_12-3.52.1 | SUSE-SU-2021:2925-1 |
| SLES for SAP 15 | xen | 4.10.4_26-3.61.1 | SUSE-SU-2021:2943-1 |
| SLES for SAP 12 SP5 | xen | 4.12.4_12-3.49.1 | SUSE-SU-2021:2924-1 |
| SLES for SAP 12 SP4 | xen | 4.11.4_20-2.60.1 | SUSE-SU-2021:2955-1 |
| SLES for SAP 12 SP3 | xen | 4.9.4_20-3.91.1 | SUSE-SU-2021:2957-1 |
| SLE Micro 5.0 | xen | 4.13.3_02-3.34.1 | SUSE-SU-2021:2922-1 |
| SLE HPC 15 SP1 | xen | 4.12.4_12-3.52.1 | SUSE-SU-2021:2925-1 |
| SLE HPC 15 | xen | 4.10.4_26-3.61.1 | SUSE-SU-2021:2943-1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_20-2.60.1 | SUSE-SU-2021:2955-1 |
| SUSE OpenStack Cloud Crowbar 8 | xen | 4.9.4_20-3.91.1 | SUSE-SU-2021:2957-1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_20-2.60.1 | SUSE-SU-2021:2955-1 |
| SUSE OpenStack Cloud 8 | xen | 4.9.4_20-3.91.1 | SUSE-SU-2021:2957-1 |
| SUSE Manager Server 4.0 | xen | 4.12.4_12-3.52.1 | SUSE-SU-2021:2925-1 |
| SUSE Manager Retail Branch Server 4.0 | xen | 4.12.4_12-3.52.1 | SUSE-SU-2021:2925-1 |
| SUSE Manager Proxy 4.0 | xen | 4.12.4_12-3.52.1 | SUSE-SU-2021:2925-1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_20-3.91.1 | SUSE-SU-2021:2957-1 |
| SUSE Enterprise Storage 6 | xen | 4.12.4_12-3.52.1 | SUSE-SU-2021:2925-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | xen | 4.14.2_04-3.9.1 | openSUSE-SU-2021:2923-1 |
| openSUSE Leap 15.2 | xen | 4.13.3_02-lp152.2.27.1 | openSUSE-SU-2021:1236-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.15.0-r1 | — |
| Alpine v3.23 | xen | 4.15.0-r1 | — |
| Alpine v3.22 | xen | 4.15.0-r1 | — |
| Alpine v3.21 | xen | 4.15.0-r1 | — |
| Alpine v3.20 | xen | 4.15.0-r1 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.15.0-r1 | — |
| Alpine v3.18 | xen | 4.15.0-r1 | — |
| Alpine v3.17 | xen | 4.15.0-r1 | — |
| Alpine v3.16 | xen | 4.15.0-r1 | — |
| Alpine v3.15 | xen | 4.15.0-r1 | — |
| Alpine v3.14 | xen | 4.15.0-r1 | — |
| Alpine v3.13 | xen | 4.14.1-r3 | — |
| Alpine v3.12 | xen | 4.13.3-r1 | — |
| Alpine v3.11 | xen | 4.13.3-r1 | — |
Advisories 12
- DSA-4931-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:2955-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2924-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3322-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2922-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2943-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2957-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2923-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1236-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2925-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14848-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2021:2923-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
References
- https://xenbits.xenproject.org/xsa/advisory-373.txt
- GLSA-202107-30 vendor-advisory