CVE-2026-42490
Fixed in a distro release EPSS <1%CVSS 6.5
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these operations may not be executed in parallel, so a system-wide lock is used. The way that lock is acquired is, however, not providing any fairness. This is CVE-2026-42489. Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. This is CVE-2026-42490.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.20 | xen | 4.18.5-r9 |
| Alpine 3.21 | xen | 4.19.5-r4 |
| Alpine 3.22 | xen | 4.20.3-r4 |
| Alpine 3.23 | xen | 4.20.3-r4 |
| Alpine 3.24 | xen | 4.21.1-r6 |
| Debian 12 | xen | 4.17.7-0+deb12u1 |
| Debian 13 | xen | 4.20.3+127-gc42374a105-0+deb13u1 |
| Debian 14 | xen | 4.20.3+127-gc42374a105-1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | xen | 4.16.7_10-150400.4.86.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | xen | 4.16.7_10-150400.4.86.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | xen | 4.17.6_12-150500.3.73.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | xen | 4.17.6_12-150500.3.73.1 |
| SUSE Linux Enterprise Micro 5.3 | xen | 4.16.7_10-150400.4.86.2 |
| SUSE Linux Enterprise Micro 5.4 | xen | 4.16.7_10-150400.4.86.2 |
| SUSE Linux Enterprise Micro 5.5 | xen | 4.17.6_12-150500.3.73.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | xen | 4.20.3_06-150700.3.41.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | xen | 4.20.3_06-150700.3.41.1 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | xen | 4.12.4_70-3.145.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | xen | 4.16.7_10-150400.4.86.2 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | xen | 4.17.6_12-150500.3.73.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | xen | 4.18.5_18-150600.3.50.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | xen | 4.12.4_70-3.145.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | xen | 4.16.7_10-150400.4.86.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | xen | 4.17.6_12-150500.3.73.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | xen | 4.18.5_18-150600.3.50.1 |
| 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 |