Description
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
A common access pattern is a batch of Grant Copy operations acting on
adjacent address ranges in the same source or destination page. For
performance reasons, Xen caches details internally to reuse already
validated data. The conditions on when to re-validate the internal data
were not correct in some cases:
- Frame numbers and grant references could wrongly be mixed up. This
is CVE-2026-102703.
- Copying by frame number (rather than grant reference) is permitted
only when operating on the caller's own memory. The check to enforce
this restriction was misplaced. This is CVE-2026-102704.
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+63-g7abfd2bce2-1 | — |
| Debian 13 | xen | 4.20.4+63-g7abfd2bce2-0+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_08-150700.3.52.1 | SUSE-SU-2026:5087-1 |
| SLES 15 SP6 | xen | 4.18.6_03-150600.3.56.1 | SUSE-SU-2026:5140-1 |
| SLES 15 SP5 | xen | 4.17.7_04-150500.3.85.1 | SUSE-SU-2026:5159-1 |
| SLES 12 SP5 | xen | 4.12.4_78-3.157.1 | SUSE-SU-2026:5139-1 |
Show 4 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_04-150500.3.85.1 | SUSE-SU-2026:5159-1 |
| SLE Micro 5.5 | xen | 4.17.7_04-150500.3.85.1 | SUSE-SU-2026:5159-1 |
| SLE HPC 15 SP5 | xen | 4.17.7_04-150500.3.85.1 | SUSE-SU-2026:5159-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.21.2-r3 | — |
| Alpine v3.23 | xen | 4.20.4-r3 | — |
| Alpine v3.22 | xen | 4.20.4-r3 | — |
| Alpine v3.21 | xen | 4.19.6-r3 | — |
Advisories 5
- WID-SEC-2026-4308 Xen: Mehrere Schwachstellen ermöglichen Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Nov 10, 2026
- SUSE-SU-2026:5159-1 Security update for xen SUSE / openSUSE Security Updates · Nov 10, 2026
- SUSE-SU-2026:5139-1 Security update for xen SUSE / openSUSE Security Updates · Nov 10, 2026
- SUSE-SU-2026:5140-1 Security update for xen SUSE / openSUSE Security Updates · Nov 10, 2026
- SUSE-SU-2026:5087-1 Security update for xen SUSE / openSUSE Security Updates · Nov 4, 2026