Description
For migration as well as to work around kernels unaware of L1TF (see
XSA-273), PV guests may be run in shadow paging mode. Since Xen itself
needs to be mapped when PV guests run, Xen and shadowed PV guests run
directly the respective shadow page tables. For 64-bit PV guests this
means running on the shadow of the guest root page table.
In the course of dealing with shortage of memory in the shadow pool
associated with a domain, shadows of page tables may be torn down. This
tearing down may include the shadow root page table that the CPU in
question is presently running on. While a precaution exists to
supposedly prevent the tearing down of the underlying live page table,
the time window covered by that precaution isn't large enough.
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 | 4.17.2+55-g0b56bed864-1 | — |
| Debian 13 | xen | 4.17.2+55-g0b56bed864-1 | — |
| Debian 12 | xen | 4.17.2+76-ge1f9cb16e2-1~deb12u1 | — |
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 SP5 | xen | 4.17.2_04-150500.3.9.1 | SUSE-SU-2023:4475-1, SUSE-SU-2023:3831-1 |
| SLES 15 SP4 | xen | 4.16.5_04-150400.4.34.1 | SUSE-SU-2023:4476-1, SUSE-SU-2023:3832-1 |
| SLES 15 SP3 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
| SLES 15 SP2 | xen | 4.13.5_04-150200.3.77.1 | SUSE-SU-2023:3895-1 |
| SLES 15 SP1 | xen | 4.12.4_38-150100.3.92.1 | SUSE-SU-2023:3902-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | xen | 4.12.4_38-3.94.1 | SUSE-SU-2023:3894-1 |
| SLES for SAP 15 SP3 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
| SLES for SAP 15 SP2 | xen | 4.13.5_04-150200.3.77.1 | SUSE-SU-2023:3895-1 |
| SLES for SAP 15 SP1 | xen | 4.12.4_38-150100.3.92.1 | SUSE-SU-2023:3902-1 |
| SLES for SAP 12 SP5 | xen | 4.12.4_38-3.94.1 | SUSE-SU-2023:3894-1 |
| SLE Micro 5.5 | xen | 4.17.2_08-150500.3.15.1 | SUSE-SU-2023:4475-1 |
| SLE Micro 5.4 | xen | 4.16.5_04-150400.4.34.1 | SUSE-SU-2023:4476-1, SUSE-SU-2023:3832-1 |
| SLE Micro 5.3 | xen | 4.16.5_04-150400.4.34.1 | SUSE-SU-2023:4476-1, SUSE-SU-2023:3832-1 |
| SLE Micro 5.2 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
| SLE Micro 5.1 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
| SLE HPC 15 SP3 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
| SLE HPC 15 SP2 | xen | 4.13.5_04-150200.3.77.1 | SUSE-SU-2023:3895-1 |
| SLE HPC 15 SP1 | xen | 4.12.4_38-150100.3.92.1 | SUSE-SU-2023:3902-1 |
| SUSE Manager Server 4.2 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
| SUSE Manager Proxy 4.2 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
| SUSE Enterprise Storage 7.1 | xen | 4.14.6_04-150300.3.54.1 | SUSE-SU-2023:3903-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.17.2_04-1.1 | openSUSE-SU-2024:13257-1 |
| openSUSE Leap 15.5 | xen | 4.17.2_04-150500.3.9.1 | SUSE-SU-2023:4475-1, SUSE-SU-2023:3831-1 |
| openSUSE Leap 15.4 | xen | 4.16.5_04-150400.4.34.1 | SUSE-SU-2023:4476-1, SUSE-SU-2023:3832-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | xen | 4.16.5_08-150400.4.40.1 | SUSE-SU-2023:4476-1 |
| openSUSE Leap Micro 5.3 | xen | 4.16.5_08-150400.4.40.1 | SUSE-SU-2023:4476-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.17.2-r1 | — |
| Alpine v3.23 | xen | 4.17.2-r1 | — |
| Alpine v3.22 | xen | 4.17.2-r1 | — |
| Alpine v3.21 | xen | 4.17.2-r1 | — |
| Alpine v3.20 | xen | 4.17.2-r1 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.17.2-r1 | — |
| Alpine v3.18 | xen | 4.17.2-r1 | — |
| Alpine v3.17 | xen | 4.16.5-r1 | — |
| Alpine v3.16 | xen | 4.16.5-r1 | — |
| Alpine v3.15 | xen | 4.15.5-r1 | — |
Advisories 10
- SUSE-SU-2023:3894-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4476-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4475-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3895-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3832-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3831-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13257-1 xen-4.17.2_04-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2023:3903-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2023:3902-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2399 Xen: Schwachstelle ermöglicht Privilegieneskalation, DoS und Offenlegung von Informationen BSI CERT-Bund (WID) · Nov 16, 2023