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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2020-29569 Detail

Description

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html Mailing List  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html Mailing List  Third Party Advisory 
https://security.gentoo.org/glsa/202107-30 Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210205-0001/ Third Party Advisory 
https://www.debian.org/security/2021/dsa-4843 Third Party Advisory 
https://xenbits.xenproject.org/xsa/advisory-350.html Patch  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

12 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-29569
NVD Published Date:
12/15/2020
NVD Last Modified:
01/19/2023
Source:
MITRE