Description
When passing through PCI devices, the detach logic in libxl won't remove
access permissions to any 64bit memory BARs the device might have. As a
result a domain can still have access any 64bit memory BAR when such
device is no longer assigned to the domain.
For PV domains the permission leak allows the domain itself to map the memory
in the page-tables. For HVM it would require a compromised device model or
stubdomain to map the leaked memory into the HVM domain p2m.
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 | 4.20.2+7-g1badcf5035-1 | — |
| Debian 13 | xen | 4.20.2+7-g1badcf5035-0+deb13u1 | DSA-6068-1 |
| Debian 12 | xen | 4.17.5+72-g01140da4e8-1 | DSA-6068-1 |
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 SP7 | xen | 4.20.2_02-150700.3.19.1 | SUSE-SU-2025:4419-1 |
| SLES 15 SP6 | xen | 4.18.5_08-150600.3.34.2 | SUSE-SU-2026:0012-1 |
| SLES 12 SP5 | xen | 4.12.4_64-3.137.1 | SUSE-SU-2026:0328-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | xen | 4.18.5_08-150600.3.34.2 | SUSE-SU-2026:0012-1 |
| SLE Micro 5.5 | xen | 4.17.6_02-150500.3.56.1 | SUSE-SU-2025:4490-1 |
| SLE Micro 5.4 | xen | 4.16.7_06-150400.4.78.1 | SUSE-SU-2026:0394-1 |
| SLE Micro 5.3 | xen | 4.16.7_06-150400.4.78.1 | SUSE-SU-2026:0394-1 |
| SLE Micro 5.2 | xen | 4.14.6_28-150300.3.94.1 | SUSE-SU-2026:0303-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.20.1_08-1.1 | openSUSE-SU-2025:15719-1 |
| openSUSE Leap 15.6 | xen | 4.18.5_08-150600.3.34.2 | SUSE-SU-2026:0012-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.20.1-r2 | — |
| Alpine v3.23 | xen | 4.20.1-r2 | — |
| Alpine v3.22 | xen | 4.20.1-r2 | — |
| Alpine v3.21 | xen | 4.19.3-r2 | — |
| Alpine v3.20 | xen | 4.18.5-r3 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.18.5-r3 | — |
Advisories 9
- openSUSE-SU-2025:15719-1 xen-4.20.1_08-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0328-1 Security update for xen SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0303-1 Security update for xen SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4490-1 Security update for xen SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0012-1 Security update for xen SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0394-1 Security update for xen SUSE / openSUSE Security Updates · Feb 7, 2026
- WID-SEC-2025-2409 Xen: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Feb 5, 2026
- SUSE-SU-2025:4419-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- DSA-6068-1 xen - security update Debian Security (DSA / DLA) · Dec 2, 2025