CVE-2020-29571
Fixed in a distro release EPSS <1%
An issue was discovered in Xen through 4.14.x. A bounds check common to most operation time functions specific to FIFO event channels depends on the CPU observing consistent state. While the producer side uses appropriately ordered writes, the consumer side isn't protected against re-ordered reads, and may hence end up de-referencing a NULL pointer. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. Only Arm systems may be vulnerable. Whether a system is vulnerable depends on the specific CPU. x86 systems are not vulnerable.
Products: xen, debian_linux, fedoraproject fedora
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.11 | xen | 4.13.2-r3 |
| Alpine 3.12 | xen | 4.13.2-r3 |
| Alpine 3.13 | xen | 4.14.1-r0 |
| Alpine 3.14 | xen | 4.14.1-r0 |
| Alpine 3.15 | xen | 4.14.1-r0 |
| Alpine 3.16 | xen | 4.14.1-r0 |
| Alpine 3.17 | xen | 4.14.1-r0 |
| Alpine 3.18 | xen | 4.14.1-r0 |
| Alpine 3.19 | xen | 4.14.1-r0 |
| Alpine 3.20 | xen | 4.14.1-r0 |
| Alpine 3.21 | xen | 4.14.1-r0 |
| Alpine 3.22 | xen | 4.14.1-r0 |
| Alpine 3.23 | xen | 4.14.1-r0 |
| Alpine 3.24 | xen | 4.14.1-r0 |
| Debian 10 | xen | 4.11.4+57-g41a822c392-2 |
| Debian 12 | xen | 4.14.0+88-g1d1d1f5391-1 |
| Debian 13 | xen | 4.14.0+88-g1d1d1f5391-1 |
| Debian 14 | xen | 4.14.0+88-g1d1d1f5391-1 |
| SUSE Enterprise Storage 5 | xen | 4.9.4_16-3.80.1 |
| SUSE HPE Helion OpenStack 8 | xen | 4.9.4_16-3.80.1 |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | xen | 4.10.4_24-3.53.1 |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | xen | 4.10.4_24-3.53.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | xen | 4.12.4_06-3.40.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | xen | 4.13.2_06-3.22.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP1 | xen | 4.12.4_06-3.40.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | xen | 4.13.2_06-3.22.1 |
| SUSE Linux Enterprise Server 11 SP4-LTSS | xen | 4.4.4_48-61.61.1 |
| SUSE Linux Enterprise Server 12 SP2-BCL | xen | 4.7.6_14-43.73.1 |
| SUSE Linux Enterprise Server 12 SP2-LTSS | xen | 4.7.6_14-43.73.1 |
| SUSE Linux Enterprise Server 12 SP3-BCL | xen | 4.9.4_16-3.80.1 |
| SUSE Linux Enterprise Server 12 SP3-LTSS | xen | 4.9.4_16-3.80.1 |
| SUSE Linux Enterprise Server 12 SP4-LTSS | xen | 4.11.4_16-2.48.1 |
| SUSE Linux Enterprise Server 12 SP5 | xen | 4.12.4_06-3.36.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | xen | 4.7.6_14-43.73.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | xen | 4.9.4_16-3.80.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | xen | 4.11.4_16-2.48.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | xen | 4.12.4_06-3.36.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 | xen | 4.10.4_24-3.53.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | xen | 4.12.4_06-3.36.1 |
| SUSE OpenStack Cloud 7 | xen | 4.7.6_14-43.73.1 |
| SUSE OpenStack Cloud 8 | xen | 4.9.4_16-3.80.1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_16-2.48.1 |
| SUSE OpenStack Cloud Crowbar 8 | xen | 4.9.4_16-3.80.1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_16-2.48.1 |
| Ubuntu 16.04 LTS | xen | no fix |
| Ubuntu 18.04 LTS | xen | no fix |
| Ubuntu 20.04 LTS | xen | no fix |
| openSUSE Leap 15.1 | xen | 4.12.4_06-lp151.2.36.1 |
| openSUSE Leap 15.2 | xen | 4.13.2_06-lp152.2.21.1 |
| openSUSE Tumbleweed | xen | 4.15.1_01-1.2 |