CVE-2021-28701
Fixed in a distro release EPSS <1%
Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.11 | xen | 4.13.3-r3 |
| Alpine 3.12 | xen | 4.13.3-r3 |
| Alpine 3.13 | xen | 4.14.2-r1 |
| Alpine 3.14 | xen | 4.15.0-r3 |
| Alpine 3.15 | xen | 4.15.0-r3 |
| Alpine 3.16 | xen | 4.15.0-r3 |
| Alpine 3.17 | xen | 4.15.0-r3 |
| Alpine 3.18 | xen | 4.15.0-r3 |
| Alpine 3.19 | xen | 4.15.0-r3 |
| Alpine 3.20 | xen | 4.15.0-r3 |
| Alpine 3.21 | xen | 4.15.0-r3 |
| Alpine 3.22 | xen | 4.15.0-r3 |
| Alpine 3.23 | xen | 4.15.0-r3 |
| Alpine 3.24 | xen | 4.15.0-r3 |
| Debian 11 | xen | 4.14.3-1~deb11u1 |
| Debian 12 | xen | 4.14.3-1 |
| Debian 13 | xen | 4.14.3-1 |
| Debian 14 | xen | 4.14.3-1 |
| SUSE Enterprise Storage 6 | xen | 4.12.4_16-3.57.1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_22-3.94.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | xen | 4.10.4_30-3.68.1 |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | xen | 4.10.4_30-3.68.1 |
| SUSE Linux Enterprise Micro 5.0 | xen | 4.13.3_04-3.37.1 |
| SUSE Linux Enterprise Micro 5.1 | xen | 4.14.2_06-3.12.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | xen | 4.13.3_04-3.37.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | xen | 4.14.2_06-3.12.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | xen | 4.13.3_04-3.37.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | xen | 4.14.2_06-3.12.1 |
| SUSE Linux Enterprise Server 11 SP4-LTSS | xen | 4.4.4_50-61.67.1 |
| SUSE Linux Enterprise Server 12 SP2-BCL | xen | 4.7.6_16-43.79.5 |
| SUSE Linux Enterprise Server 12 SP3-BCL | xen | 4.9.4_22-3.94.2 |
| SUSE Linux Enterprise Server 12 SP3-LTSS | xen | 4.9.4_22-3.94.2 |
| SUSE Linux Enterprise Server 12 SP4-LTSS | xen | 4.11.4_24-2.65.1 |
| SUSE Linux Enterprise Server 12 SP5 | xen | 4.12.4_14-3.52.1 |
| SUSE Linux Enterprise Server 15 SP1-BCL | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise Server 15 SP1-LTSS | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | xen | 4.9.4_22-3.94.2 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | xen | 4.11.4_24-2.65.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | xen | 4.12.4_14-3.52.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 | xen | 4.10.4_30-3.68.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | xen | 4.12.4_16-3.57.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | xen | 4.12.4_14-3.52.1 |
| SUSE OpenStack Cloud 8 | xen | 4.9.4_22-3.94.2 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_24-2.65.1 |
| SUSE OpenStack Cloud Crowbar 8 | xen | 4.9.4_22-3.94.2 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_24-2.65.1 |
| Ubuntu 16.04 LTS | xen | no fix |
| Ubuntu 18.04 LTS | xen | no fix |
| Ubuntu 20.04 LTS | xen | no fix |
| Ubuntu 22.04 LTS | xen | no fix |
| Ubuntu 24.04 LTS | xen | no fix |
| Ubuntu 25.10 | xen | no fix |
| Ubuntu 26.04 LTS | xen | no fix |
| Ubuntu 26.10 | xen | no fix |
| openSUSE Leap 15.2 | xen | 4.13.3_04-lp152.2.30.1 |
| openSUSE Leap 15.3 | xen | 4.14.2_06-3.12.1 |