Vulnerability Details : CVE-2020-25604

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.
Vulnerability category: Denial of service
Published 2020-09-23 22:15:14
Updated 2022-09-30 03:44:55
Source MITRE
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2020-25604

Probability of exploitation activity in the next 30 days: 0.05%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 12 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2020-25604

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
1.9
 LOW AV:L/AC:M/Au:N/C:N/I:N/A:P
3.4
2.9
 nvd@nist.gov
4.7
 MEDIUM CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
1.0
3.6
 nvd@nist.gov

CWE ids for CVE-2020-25604

References for CVE-2020-25604

Products affected by CVE-2020-25604

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