Description
Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected.
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 | 4.8.1-1+deb9u3 | — |
| Debian 13 | xen | 4.8.1-1+deb9u3 | — |
| Debian 12 | xen | 4.8.1-1+deb9u3 | — |
| Debian 9 | xen | 4.8.1-1+deb9u3 | DSA-3969-1 |
| Debian 8 | xen | 4.4.1-9+deb8u10 | DSA-3969-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | xen | 4.1.6.lts1-9 | DLA-1132-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | xen | 4.6.5-0ubuntu1.4 | — |
| Ubuntu 14.04 LTS | xen | 4.4.2-0ubuntu0.14.04.14 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | xen | 4.9.0_11-3.9.1 | SUSE-SU-2017:2327-2, SUSE-SU-2017:2327-1 |
| SLES 12 SP2 | xen | 4.7.3_03-43.9.1 | SUSE-SU-2017:2326-1 |
| SLES 12 | xen | 4.4.4_22-22.51.2 | SUSE-SU-2017:2541-1 |
| SLES 11 SP4 | xen | 4.4.4_22-61.9.2 | SUSE-SU-2017:2450-1 |
| SLES 11 SP3 | xen | 4.2.5_21-45.5.1 | SUSE-SU-2017:2339-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | xen | 4.9.0_11-3.9.1 | SUSE-SU-2017:2327-2 |
| SLES for SAP 12 SP2 | xen | 4.7.3_03-43.9.1 | SUSE-SU-2017:2326-1 |
| SLES for SAP 12 | xen | 4.4.4_22-22.51.2 | SUSE-SU-2017:2541-1 |
| SLES for SAP 11 SP4 | xen | 4.4.4_22-61.9.2 | SUSE-SU-2017:2450-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | xen | 4.2.5_21-45.5.1 | SUSE-SU-2017:2339-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.9.0-r1 | — |
| Alpine v3.23 | xen | 4.9.0-r1 | — |
| Alpine v3.22 | xen | 4.9.0-r1 | — |
| Alpine v3.21 | xen | 4.9.0-r1 | — |
| Alpine v3.20 | xen | 4.9.0-r1 | — |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.9.0-r1 | — |
| Alpine v3.18 | xen | 4.9.0-r1 | — |
| Alpine v3.17 | xen | 4.9.0-r1 | — |
| Alpine v3.16 | xen | 4.9.0-r1 | — |
| Alpine v3.15 | xen | 4.9.0-r1 | — |
| Alpine v3.14 | xen | 4.9.0-r1 | — |
| Alpine v3.13 | xen | 4.9.0-r1 | — |
| Alpine v3.12 | xen | 4.9.0-r1 | — |
| Alpine v3.11 | xen | 4.9.0-r1 | — |
| Alpine v3.10 | xen | 4.9.0-r1 | — |
| Alpine v3.9 | xen | 4.9.0-r1 | — |
| Alpine v3.8 | xen | 4.9.0-r1 | — |
| Alpine v3.7 | xen | 4.9.0-r1 | — |
| Alpine v3.6 | xen | 4.8.2-r0 | — |
| Alpine v3.5 | xen | 4.7.3-r0 | — |
| Alpine v3.4 | xen | 4.6.6-r0 | — |
| Alpine v3.3 | xen | 4.6.6-r0 | — |
Advisories 8
- DSA-3969-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1132-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2450-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2326-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2339-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2541-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2327-2 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2327-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
References
- https://support.citrix.com/article/CTX225941
- 1039177 vdb-entry
- 100341 vdb-entry
- DSA-3969 vendor-advisory
- http://xenbits.xen.org/xsa/advisory-230.html