Description
x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.
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 | 4.16.2+90-g0d39a6d1ae-1 | — |
| Debian 13 | xen | 4.16.2+90-g0d39a6d1ae-1 | — |
| Debian 12 | xen | 4.16.2+90-g0d39a6d1ae-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 SP4 | xen | 4.16.2_08-150400.4.16.1 | SUSE-SU-2022:4007-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.3 | xen | 4.16.2_08-150400.4.16.1 | SUSE-SU-2022:4007-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | xen | 4.16.2_08-150400.4.16.1 | SUSE-SU-2022:4007-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.16.2-r1 | — |
| Alpine v3.23 | xen | 4.16.2-r1 | — |
| Alpine v3.22 | xen | 4.16.2-r1 | — |
| Alpine v3.21 | xen | 4.16.2-r1 | — |
| Alpine v3.20 | xen | 4.16.2-r1 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.16.2-r1 | — |
| Alpine v3.18 | xen | 4.16.2-r1 | — |
| Alpine v3.17 | xen | 4.16.2-r1 | — |
| Alpine v3.15 | xen | 4.15.4-r0 | — |
| Alpine v3.14 | xen | 4.15.4-r0 | — |
Advisories 2
- SUSE-SU-2022:4007-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-1939 Xen: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 4, 2024
References
- https://xenbits.xenproject.org/xsa/advisory-412.txt
- http://xenbits.xen.org/xsa/advisory-412.html
- [oss-security] 20221101 Xen Security Advisory 412 v2 (CVE-2022-42327) - x86: unintended memory sharing between guests mailing-list
- FEDORA-2022-07438e12df vendor-advisory
- FEDORA-2022-9f51d13fa3 vendor-advisory
- GLSA-202402-07 vendor-advisory