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CVE
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CVE-2020-25604Date: (C)2020-09-24   (M)2024-02-22


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 4.7CVSS Score : 1.9
Exploit Score: 1.0Exploit Score: 3.4
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: LOCALAccess Vector: LOCAL
Attack Complexity: HIGHAccess Complexity: MEDIUM
Privileges Required: LOWAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: PARTIAL
Integrity: NONE 
Availability: HIGH 
  
Reference:
DSA-4769
FEDORA-2020-306b84fd07
FEDORA-2020-d46fe34349
FEDORA-2020-f668e579be
GLSA-202011-06
https://xenbits.xen.org/xsa/advisory-336.html
openSUSE-SU-2020:1608

CWE    1
CWE-362
OVAL    13
oval:org.secpod.oval:def:66685
oval:org.secpod.oval:def:89050323
oval:org.secpod.oval:def:89050392
oval:org.secpod.oval:def:118752
...

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