Description
Because of a logical error in XSA-407 (Branch Type Confusion), the
mitigation is not applied properly when it is intended to be used.
XSA-434 (Speculative Return Stack Overflow) uses the same
infrastructure, so is equally impacted.
For more details, see:
https://xenbits.xen.org/xsa/advisory-407.html
https://xenbits.xen.org/xsa/advisory-434.html
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 | 4.19.1-1 | — |
| Debian 13 | xen | 4.19.1-1 | — |
| Debian 12 | xen | 4.17.5+23-ga4e5191dc0-1 | DSA-5836-1 |
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 SP5 | xen | 4.17.4_02-150500.3.30.1 | SUSE-SU-2024:1295-1 |
| SLES 15 SP2 | xen | 4.13.5_12-150200.3.93.1 | SUSE-SU-2024:2535-1 |
| SLES 12 SP5 | xen | 4.12.4_48-3.109.1 | SUSE-SU-2024:1541-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP2 | xen | 4.13.5_12-150200.3.93.1 | SUSE-SU-2024:2535-1 |
| SLES for SAP 12 SP5 | xen | 4.12.4_48-3.109.1 | SUSE-SU-2024:1541-1 |
| SLE Micro 5.5 | xen | 4.17.4_02-150500.3.30.1 | SUSE-SU-2024:1295-1 |
| SLE Micro 5.4 | xen | 4.16.6_02-150400.4.55.1 | SUSE-SU-2024:1259-1 |
| SLE Micro 5.3 | xen | 4.16.6_02-150400.4.55.1 | SUSE-SU-2024:1259-1 |
| SLE Micro 5.2 | xen | 4.14.6_14-150300.3.72.1 | SUSE-SU-2024:1540-1 |
| SLE Micro 5.1 | xen | 4.14.6_14-150300.3.72.1 | SUSE-SU-2024:1540-1 |
| SLE HPC 15 SP2 | xen | 4.13.5_12-150200.3.93.1 | SUSE-SU-2024:2535-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.18.2_02-1.1 | openSUSE-SU-2024:13853-1 |
| openSUSE Leap 15.5 | xen | 4.17.4_02-150500.3.30.1 | SUSE-SU-2024:1295-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | xen | 4.16.6_02-150400.4.55.1 | SUSE-SU-2024:1259-1 |
| openSUSE Leap Micro 5.3 | xen | 4.16.6_02-150400.4.55.1 | SUSE-SU-2024:1259-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.18.2-r0 | — |
| Alpine v3.23 | xen | 4.18.2-r0 | — |
| Alpine v3.22 | xen | 4.18.2-r0 | — |
| Alpine v3.21 | xen | 4.18.2-r0 | — |
| Alpine v3.20 | xen | 4.18.2-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.18.2-r0 | — |
| Alpine v3.18 | xen | 4.17.4-r0 | — |
| Alpine v3.17 | xen | 4.16.6-r0 | — |
| Alpine v3.16 | xen | 4.16.6-r0 | — |
Advisories 8
- DSA-5836-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2024:1259-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1541-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1540-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13853-1 xen-4.18.2_02-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1295-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2535-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0831 Xen: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Dec 26, 2024