Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Xen | xen | 4.15.x – < unspecified, 4.11.x, 4.12.x – < unspecified | 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 | 4.14.3-1 | — |
| Debian 13 | xen | 4.14.3-1 | — |
| Debian 12 | xen | 4.14.3-1 | — |
| Debian 11 | xen | 4.14.3-1~deb11u1 | DSA-4977-1 |
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 | 4.14.2_06-3.12.1 | SUSE-SU-2021:3140-1 |
| SLES 15 SP2 | xen | 4.13.3_04-3.37.1 | SUSE-SU-2021:3141-1 |
| SLES 15 SP1 | xen | 4.12.4_16-3.57.1 | SUSE-SU-2021:3977-1 |
| SLES 12 SP5 | xen | 4.12.4_14-3.52.1 | SUSE-SU-2021:3181-1 |
| 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_22-3.94.2 | SUSE-SU-2021:3213-1 |
| SLES 12 SP2 | xen | 4.7.6_16-43.79.5 | SUSE-SU-2021:3322-1 |
| 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_14-3.52.1 | SUSE-SU-2021:3181-1 |
| 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_22-3.94.2 | SUSE-SU-2021:3213-1 |
| SLE Micro 5.1 | xen | 4.14.2_06-3.12.1 | SUSE-SU-2021:3140-2 |
| SLE Micro 5.0 | xen | 4.13.3_04-3.37.1 | SUSE-SU-2021:3141-1 |
| 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_22-3.94.2 | SUSE-SU-2021:3213-1 |
| 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_22-3.94.2 | SUSE-SU-2021:3213-1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_22-3.94.2 | SUSE-SU-2021:3213-1 |
| 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 | 4.14.2_06-3.12.1 | openSUSE-SU-2021:3140-1 |
| openSUSE Leap 15.2 | xen | 4.13.3_04-lp152.2.30.1 | openSUSE-SU-2021:1301-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.15.0-r3 | — |
| Alpine v3.23 | xen | 4.15.0-r3 | — |
| Alpine v3.22 | xen | 4.15.0-r3 | — |
| Alpine v3.21 | xen | 4.15.0-r3 | — |
| Alpine v3.20 | xen | 4.15.0-r3 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.15.0-r3 | — |
| Alpine v3.18 | xen | 4.15.0-r3 | — |
| Alpine v3.17 | xen | 4.15.0-r3 | — |
| Alpine v3.16 | xen | 4.15.0-r3 | — |
| Alpine v3.15 | xen | 4.15.0-r3 | — |
| Alpine v3.14 | xen | 4.15.0-r3 | — |
| Alpine v3.13 | xen | 4.14.2-r1 | — |
| Alpine v3.12 | xen | 4.13.3-r3 | — |
| Alpine v3.11 | xen | 4.13.3-r3 | — |
Advisories 13
- DSA-4977-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:3181-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3140-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1301-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3322-1 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-2021:3842-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3140-2 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3213-1 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
- openSUSE-SU-2021:3140-1 Security update for xen SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2021:14848-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2021:3141-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
References
- https://xenbits.xenproject.org/xsa/advisory-384.txt
- http://xenbits.xen.org/xsa/advisory-384.html
- [oss-security] 20210908 Xen Security Advisory 384 v3 (CVE-2021-28701) - Another race in XENMAPSPACE_grant_table handling mailing-list
- FEDORA-2021-11577e5229 vendor-advisory
- FEDORA-2021-fed53cbc7d vendor-advisory
- DSA-4977 vendor-advisory
- FEDORA-2021-5a0c7bc619 vendor-advisory
- GLSA-202208-23 vendor-advisory