CVEvulnerability

CVE-2020-25604

4.7 MEDIUM Published 2020-09-23 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-09-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.7 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
1.9 LOW — AV:L/AC:M/Au:N/C:N/I:N/A:P
Weaknesses
CWE-362

Description

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.

Affected configurations

• xen xen (<= 4.14.0) • fedoraproject fedora 31 • fedoraproject fedora 32 • fedoraproject fedora 33 • debian debian linux 10.0 • opensuse leap 15.2

Related

Weakness · CWE (1)

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness

References