CVE-2020-29567

Published: Dic 15, 2020 Last Modified: Nov 21, 2024 EU-VD ID: EUVD-2020-21929 Aliases: GSD-2020-29567
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,2
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
MEDIUM 4,9
Source: [email protected]
Access Vector: local
Access Complexity: low
Authentication: none
Confidentiality: none
Integrity: none
Availability: complete

Description

AI Translation Available

An issue was discovered in Xen 4.14.x. When moving IRQs between CPUs to distribute the load of IRQ handling, IRQ vectors are dynamically allocated and de-allocated on the relevant CPUs. De-allocation has to happen when certain constraints are met. If these conditions are not met when first checked, the checking CPU may send an interrupt to itself, in the expectation that this IRQ will be delivered only after the condition preventing the cleanup has cleared. For two specific IRQ vectors, this expectation was violated, resulting in a continuous stream of self-interrupts, which renders the CPU effectively unusable. A domain with a passed through PCI device can cause lockup of a physical CPU, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only guests with physical PCI devices passed through to them can exploit the vulnerability.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0006
Percentile
0,2th
Updated

EPSS Score Trend (Last 91 Days)

770

Allocation of Resources Without Limits or Throttling

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Availability
Potential Impacts:
Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Dos: Resource Consumption (Other)
Applicable Platforms
All platforms may be affected
Likelihood of Exploit: High
View CWE Details
Operating System

Xen by Xen

Product Information
Vendor Xen
Product Xen
Version Range Affected
To 4.14.0 (inclusive)
cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Fedora by Fedoraproject

Product Information
Vendor Fedoraproject
Product Fedora
Version 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://security.gentoo.org/glsa/202107-30
Third Party Advisory
https://security.gentoo.org/glsa/202107-30
https://xenbits.xenproject.org/xsa/advisory-356.html
Patch Vendor Advisory
https://xenbits.xenproject.org/xsa/advisory-356.html
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://security.gentoo.org/glsa/202107-30
Third Party Advisory
https://security.gentoo.org/glsa/202107-30
https://xenbits.xenproject.org/xsa/advisory-356.html
Patch Vendor Advisory
https://xenbits.xenproject.org/xsa/advisory-356.html