CVE-2020-29569

 

Published at: - 15-12-2020 06:15

Last modified: - 19-01-2023 04:53

Total changes: - 11

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://xenbits.xenproject.org/xsa/advisory-350.html
• DSA-4843-Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210205-0001/
• [debian-lts-announce] 20210212 [SECURITY] [DLA 2557-1] linux-4.19 security update-Mailing List, Third Party Advisory
• [debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update-Mailing List, Third Party Advisory
• GLSA-202107-30-Third Party Advisory

 

Keywords

NVD

 

CVE-2020-29569

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures