CVE-2020-25604
 
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
Se detectó un problema en Xen versiones hasta 4.14.x. Se presenta una condición de carrera cuando se migran temporizadores entre x86 HVM vCPUs. Al migrar temporizadores de invitados de x86 HVM entre sus vCPU, el modelo de bloqueo utilizado permite que una segunda vCPU del mismo invitado (que también opera en los temporizadores) para liberar un bloqueo que no adquirió. El efecto más probable del problema es un bloqueo o bloqueo del hypervisor, es decir, una Denegación de Servicio (DoS). Todas las versiones de Xen están afectadas. Solo los sistemas x86 son vulnerables. Los sistemas Arm no son vulnerables. Solo los invitados x86 HVM pueden aprovechar la vulnerabilidad. x86 PV y PVH no pueden aprovechar la vulnerabilidad. Solo los invitados con más de una vCPU pueden explotar la vulnerabilidad
CVSS Scores
SSVC
- Decision:-
Timeline
- 2020-09-16 CVE Reserved
- 2020-09-23 CVE Published
- 2023-03-08 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC
References (7)
URL | Tag | Source |
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URL | Date | SRC |
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URL | Date | SRC |
---|---|---|
https://xenbits.xen.org/xsa/advisory-336.html | 2023-11-07 |
Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Xen Search vendor "Xen" | Xen Search vendor "Xen" for product "Xen" | <= 4.14.0 Search vendor "Xen" for product "Xen" and version " <= 4.14.0" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 31 Search vendor "Fedoraproject" for product "Fedora" and version "31" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 32 Search vendor "Fedoraproject" for product "Fedora" and version "32" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
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Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0" | - |
Affected
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Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | 15.2 Search vendor "Opensuse" for product "Leap" and version "15.2" | - |
Affected
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