VDB
CVE-2020-29571
CVE-2020-29571
PUBLISHED
CVSS 6.199999809265137 MEDIUM
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.
EPSS 0.38% · 30.0th percentile
Risk Scores
CVSS 3.1
6.199999809265137
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.38%
30.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:16.04:LTS | xen | 0, 4.5.1-0ubuntu1, 4.5.1-0ubuntu2 |
| Ubuntu:18.04:LTS | xen | 0, 4.9.0-0ubuntu4, 4.9.2-0ubuntu1 |
| Ubuntu:20.04:LTS | xen | 0, 4.9.2-0ubuntu2, 4.9.2-0ubuntu6 |
Timeline
- Dec 15, 2020 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 25, 2021 EPSS Score
- Oct 27, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Mar 2, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 4, 2022 EPSS Score
- Jul 6, 2022 EPSS Score
- Sep 7, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2020-29571 third-party-advisory
- https://xenbits.xen.org/xsa/advisory-359.html third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-29571 third-party-advisory