Description
issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Xen | xen | 4.14.x, 4.12.x, 4.15.x, xen-unstable, 4.13.x | — |
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 v3.24 | xen | 4.15.1-r2 | — |
| Alpine v3.23 | xen | 4.15.1-r2 | — |
| Alpine v3.22 | xen | 4.15.1-r2 | — |
| Alpine v3.21 | xen | 4.15.1-r2 | — |
| Alpine v3.20 | xen | 4.15.1-r2 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.15.1-r2 | — |
| Alpine v3.18 | xen | 4.15.1-r2 | — |
| Alpine v3.17 | xen | 4.15.1-r2 | — |
| Alpine v3.16 | xen | 4.15.1-r2 | — |
| Alpine v3.15 | xen | 4.15.1-r2 | — |
| Alpine v3.14 | xen | 4.15.1-r2 | — |
| Alpine v3.13 | xen | 4.14.3-r2 | — |
| 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-389.txt
- FEDORA-2021-03645e9807 vendor-advisory
- DSA-5017 vendor-advisory
- FEDORA-2021-2b3a2de94f vendor-advisory
- GLSA-202402-07 vendor-advisory