Description
XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain
other grant table operations. Sadly a v2 -> v1 -> v2 change has yet
another effect which wasn't accounted for: During the first change, status
pages would be freed. During the second change they would be allocated
again. Hence across the full pair of change the addresses of the status
pages may change, rendering stale previously calculated pointers into the
status array.
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 | 4.20.4+39-gf1e1321c87-1 | — |
| Debian 13 | xen | 4.20.4+39-gf1e1321c87-0+deb13u1 | — |
| Debian 12 | xen | 4.17.7+13-g2445b30a44-0+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 24.04 LTS | xen | No fix yet | — |
| Ubuntu 22.04 LTS | xen | No fix yet | — |
| Ubuntu 20.04 LTS | xen | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | 4.20.4_06-150700.3.49.2 | SUSE-SU-2026:4942-1 |
| SLES 15 SP6 | xen | 4.18.6_03-150600.3.56.1 | SUSE-SU-2026:5140-1 |
| SLES 15 SP5 | xen | 4.17.7_02-150500.3.82.1 | SUSE-SU-2026:4641-1 |
| SLES 15 SP4 | xen | 4.16.7_16-150400.4.95.1 | SUSE-SU-2026:4642-1 |
| SLES 12 SP5 | xen | 4.12.4_76-3.154.1 | SUSE-SU-2026:4732-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | xen | 4.18.6_03-150600.3.56.1 | SUSE-SU-2026:5140-1 |
| SLES for SAP 15 SP5 | xen | 4.17.7_02-150500.3.82.1 | SUSE-SU-2026:4641-1 |
| SLES for SAP 15 SP4 | xen | 4.16.7_16-150400.4.95.1 | SUSE-SU-2026:4642-1 |
| SLE Micro 5.5 | xen | 4.17.7_02-150500.3.82.1 | SUSE-SU-2026:4641-1 |
| SLE Micro 5.4 | xen | 4.16.7_16-150400.4.95.1 | SUSE-SU-2026:4642-1 |
| SLE Micro 5.3 | xen | 4.16.7_16-150400.4.95.1 | SUSE-SU-2026:4642-1 |
| SLE HPC 15 SP5 | xen | 4.17.7_02-150500.3.82.1 | SUSE-SU-2026:4641-1 |
| SLE HPC 15 SP4 | xen | 4.16.7_16-150400.4.95.1 | SUSE-SU-2026:4642-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.22.0_06-1.1 | openSUSE-SU-2026:12138-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.21.2-r2 | — |
| Alpine v3.23 | xen | 4.20.4-r2 | — |
| Alpine v3.22 | xen | 4.20.4-r2 | — |
| Alpine v3.21 | xen | 4.19.6-r2 | — |
Advisories 7
- SUSE-SU-2026:5140-1 Security update for xen SUSE / openSUSE Security Updates · Nov 10, 2026
- WID-SEC-2026-3930 Xen: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- SUSE-SU-2026:4942-1 Security update for xen SUSE / openSUSE Security Updates · Oct 31, 2026
- SUSE-SU-2026:4732-1 Security update for xen SUSE / openSUSE Security Updates · Oct 20, 2026
- openSUSE-SU-2026:12138-1 xen-4.22.0_06-1.1 on GA media SUSE / openSUSE Security Updates · Oct 15, 2026
- SUSE-SU-2026:4641-1 Security update for xen SUSE / openSUSE Security Updates · Oct 14, 2026
- SUSE-SU-2026:4642-1 Security update for xen SUSE / openSUSE Security Updates · Oct 14, 2026