CVE-2020-25604
Fixed in a distro release EPSS <1%
An issue was discovered in Xen through 4.14.x. There is a race condition when migrating timers between x86 HVM vCPUs. When migrating timers of x86 HVM guests between its vCPUs, the locking model used allows for a second vCPU of the same guest (also operating on the timers) to release a lock that it didn't acquire. The most likely effect of the issue is a hang or crash of the hypervisor, i.e., a Denial of Service (DoS). All versions of Xen are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only x86 HVM guests can leverage the vulnerability. x86 PV and PVH cannot leverage the vulnerability. Only guests with more than one vCPU can exploit the vulnerability.
Products: xen, fedoraproject fedora, debian_linux, opensuse leap
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.10 | xen | 4.12.3-r4 |
| Alpine 3.11 | xen | 4.13.1-r4 |
| Alpine 3.12 | xen | 4.13.1-r4 |
| Alpine 3.13 | xen | 4.14.0-r1 |
| Alpine 3.14 | xen | 4.14.0-r1 |
| Alpine 3.15 | xen | 4.14.0-r1 |
| Alpine 3.16 | xen | 4.14.0-r1 |
| Alpine 3.17 | xen | 4.14.0-r1 |
| Alpine 3.18 | xen | 4.14.0-r1 |
| Alpine 3.19 | xen | 4.14.0-r1 |
| Alpine 3.20 | xen | 4.14.0-r1 |
| Alpine 3.21 | xen | 4.14.0-r1 |
| Alpine 3.22 | xen | 4.14.0-r1 |
| Alpine 3.23 | xen | 4.14.0-r1 |
| Alpine 3.24 | xen | 4.14.0-r1 |
| Alpine 3.9 | xen | 4.11.4-r2 |
| Debian 10 | xen | 4.11.4+37-g3263f257ca-1 |
| Debian 12 | xen | 4.14.0+80-gd101b417b7-1 |
| Debian 13 | xen | 4.14.0+80-gd101b417b7-1 |
| Debian 14 | xen | 4.14.0+80-gd101b417b7-1 |
| SUSE Enterprise Storage 5 | xen | 4.9.4_12-3.74.1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_12-3.74.1 |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | xen | 4.10.4_16-3.41.1 |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | xen | 4.10.4_16-3.41.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | xen | 4.12.3_08-3.28.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | xen | 4.13.1_08-3.10.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP1 | xen | 4.12.3_08-3.28.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | xen | 4.13.1_08-3.10.1 |
| SUSE Linux Enterprise Server 11 SP4-LTSS | xen | 4.4.4_44-61.55.1 |
| SUSE Linux Enterprise Server 12 SP2-BCL | xen | 4.7.6_10-43.67.1 |
| SUSE Linux Enterprise Server 12 SP2-LTSS | xen | 4.7.6_10-43.67.1 |
| SUSE Linux Enterprise Server 12 SP3-BCL | xen | 4.9.4_12-3.74.1 |
| SUSE Linux Enterprise Server 12 SP3-LTSS | xen | 4.9.4_12-3.74.1 |
| SUSE Linux Enterprise Server 12 SP4-LTSS | xen | 4.11.4_08-2.36.1 |
| SUSE Linux Enterprise Server 12 SP5 | xen | 4.12.3_08-3.24.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | xen | 4.7.6_10-43.67.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | xen | 4.9.4_12-3.74.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | xen | 4.11.4_08-2.36.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | xen | 4.12.3_08-3.24.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 | xen | 4.10.4_16-3.41.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | xen | 4.12.3_08-3.24.1 |
| SUSE OpenStack Cloud 7 | xen | 4.7.6_10-43.67.1 |
| SUSE OpenStack Cloud 8 | xen | 4.9.4_12-3.74.1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_08-2.36.1 |
| SUSE OpenStack Cloud Crowbar 8 | xen | 4.9.4_12-3.74.1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_08-2.36.1 |
| Ubuntu 16.04 LTS | xen | no fix |
| Ubuntu 18.04 LTS | xen | no fix |
| Ubuntu 20.04 LTS | xen | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 |
| openSUSE Leap 15.2 | xen | 4.13.1_08-lp152.2.9.1 |
| openSUSE Tumbleweed | xen | 4.15.1_01-1.2 |