Description
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Xen | xen | 4.12.x, 4.14.x – < unspecified, xen-unstable, 4.13.x | unspecified |
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 | 4.14.3+32-g9de3671772-1 | — |
| Debian 13 | xen | 4.14.3+32-g9de3671772-1 | — |
| Debian 12 | xen | 4.14.3+32-g9de3671772-1 | — |
| Debian 11 | xen | 4.14.3+32-g9de3671772-1~deb11u1 | DSA-5017-1 |
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 SP3 | xen | 4.14.3_04-3.15.1 | SUSE-SU-2021:3968-1 |
| SLES 15 SP2 | xen | 4.13.4_02-3.40.1 | SUSE-SU-2021:3888-1 |
| SLES 15 SP1 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
| SLES 12 SP5 | xen | 4.12.4_16-3.55.1 | SUSE-SU-2021:3852-1 |
| SLES 12 SP4 | xen | 4.11.4_24-2.65.1 | SUSE-SU-2021:3849-1 |
Show 18 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | xen | 4.9.4_24-3.97.1 | SUSE-SU-2021:3851-1 |
| SLES 12 SP2 | xen | 4.7.6_18-43.82.1 | SUSE-SU-2021:3813-1 |
| SLES 11 SP4 | xen | 4.4.4_50-61.67.1 | SUSE-SU-2021:14848-1 |
| SLES for SAP 15 SP1 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
| SLES for SAP 15 | xen | 4.10.4_30-3.68.1 | SUSE-SU-2021:3842-1 |
| SLES for SAP 12 SP5 | xen | 4.12.4_16-3.55.1 | SUSE-SU-2021:3852-1 |
| SLES for SAP 12 SP4 | xen | 4.11.4_24-2.65.1 | SUSE-SU-2021:3849-1 |
| SLES for SAP 12 SP3 | xen | 4.9.4_24-3.97.1 | SUSE-SU-2021:3851-1 |
| SLE Micro 5.1 | xen | 4.14.3_04-3.15.1 | SUSE-SU-2021:3968-1 |
| SLE Micro 5.0 | xen | 4.13.4_02-3.40.1 | SUSE-SU-2021:3888-1 |
| SLE HPC 15 SP1 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
| SLE HPC 15 | xen | 4.10.4_30-3.68.1 | SUSE-SU-2021:3842-1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_24-2.65.1 | SUSE-SU-2021:3849-1 |
| SUSE OpenStack Cloud Crowbar 8 | xen | 4.9.4_24-3.97.1 | SUSE-SU-2021:3851-1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_24-2.65.1 | SUSE-SU-2021:3849-1 |
| SUSE OpenStack Cloud 8 | xen | 4.9.4_24-3.97.1 | SUSE-SU-2021:3851-1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_24-3.97.1 | SUSE-SU-2021:3851-1 |
| SUSE Enterprise Storage 6 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | xen | 4.14.3_04-3.15.1 | openSUSE-SU-2021:3968-1 |
| openSUSE Leap 15.2 | xen | 4.13.4_02-lp152.2.33.1 | openSUSE-SU-2021:1543-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.15 | xen | 4.15.2-r0 | — |
| Alpine v3.14 | xen | 4.15.2-r0 | — |
| Alpine v3.13 | xen | 4.14.5-r0 | — |
| Alpine v3.12 | xen | 4.13.4-r2 | — |
| Alpine v3.11 | xen | 4.13.4-r2 | — |
Advisories 13
- DSA-5017-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:3851-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3813-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3968-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3888-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3968-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1543-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3977-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3852-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3842-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3849-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14848-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-0281 Xen: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 4, 2024
References
- https://xenbits.xenproject.org/xsa/advisory-385.txt
- FEDORA-2021-03645e9807 vendor-advisory
- DSA-5017 vendor-advisory
- FEDORA-2021-2b3a2de94f vendor-advisory
- GLSA-202402-07 vendor-advisory