Executive Summary

Name CVE-2020-29569 First vendor Publication 2020-12-15
Vendor Cve Last vendor Modification 2021-02-12

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Overall CVSS Score 8.8
Base Score 8.8 Environmental Score 8.8
impact SubScore 6 Temporal Score 8.8
Exploitabality Sub Score 2
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Changed Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 7.2 Attack Range Local
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29569

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-252 Unchecked Return Value

CPE : Common Platform Enumeration

Application 18
Os 1
Os 3363
Os 200

Sources (Detail)

Source Url
CONFIRM https://security.netapp.com/advisory/ntap-20210205-0001/
DEBIAN https://www.debian.org/security/2021/dsa-4843
MISC https://xenbits.xenproject.org/xsa/advisory-350.html
MLIST https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html

Alert History

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Date Informations
2021-02-13 05:22:49
  • Multiple Updates
2021-02-05 17:22:52
  • Multiple Updates
2021-02-04 21:23:24
  • Multiple Updates
2021-02-02 17:22:52
  • Multiple Updates
2021-01-14 01:32:34
  • Multiple Updates
2021-01-13 01:31:24
  • Multiple Updates
2020-12-18 21:23:25
  • Multiple Updates
2020-12-15 21:23:51
  • First insertion