Description
When setting up interrupt remapping for legacy PCI(-X) devices,
including PCI(-X) bridges, a lookup of the upstream bridge is required.
This lookup, itself involving acquiring of a lock, is done in a context
where acquiring that lock is unsafe. This can lead to a deadlock.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Xen | Xen | — | — |
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 | 4.20.0-1 | — |
| Debian 13 | xen | 4.20.0-1 | — |
| Debian 12 | xen | 4.17.5+72-g01140da4e8-1 | — |
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 SP6 | xen | 4.18.4_06-150600.3.20.1 | SUSE-SU-2025:1162-1 |
| SLES 15 SP4 | xen | 4.16.7_02-150400.4.72.1 | SUSE-SU-2025:02326-1 |
| SLES 12 SP5 | xen | 4.12.4_60-3.127.1 | SUSE-SU-2025:02290-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | xen | 4.16.7_02-150400.4.72.1 | SUSE-SU-2025:02326-1 |
| SLE Micro 5.5 | xen | 4.17.5_08-150500.3.45.1 | SUSE-SU-2025:01860-1 |
| SLE Micro 5.4 | xen | 4.16.7_02-150400.4.72.1 | SUSE-SU-2025:02326-1 |
| SLE Micro 5.3 | xen | 4.16.7_02-150400.4.72.1 | SUSE-SU-2025:02326-1 |
| SLE Micro 5.2 | xen | 4.14.6_24-150300.3.87.1 | SUSE-SU-2025:01850-1 |
| SLE Micro 5.1 | xen | 4.14.6_24-150300.3.87.1 | SUSE-SU-2025:01850-1 |
| SLE HPC 15 SP4 | xen | 4.16.7_02-150400.4.72.1 | SUSE-SU-2025:02326-1 |
| SUSE Manager Server 4.3 | xen | 4.16.7_02-150400.4.72.1 | SUSE-SU-2025:02326-1 |
| SUSE Manager Proxy 4.3 | xen | 4.16.7_02-150400.4.72.1 | SUSE-SU-2025:02326-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.20.0_08-4.1 | openSUSE-SU-2025:14860-1 |
| openSUSE Leap 15.6 | xen | 4.18.4_06-150600.3.20.1 | SUSE-SU-2025:1162-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.19.1-r1 | — |
| Alpine v3.23 | xen | 4.19.1-r1 | — |
| Alpine v3.22 | xen | 4.19.1-r1 | — |
| Alpine v3.21 | xen | 4.19.2-r0 | — |
| Alpine v3.20 | xen | 4.18.4-r1 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.18.4-r1 | — |
| Alpine v3.18 | xen | 4.17.5-r3 | — |
Advisories 7
- SUSE-SU-2025:01860-1 Security update for xen SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02326-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01850-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1162-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:02290-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14860-1 xen-4.20.0_08-4.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0456 Xen: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Dec 2, 2025