CVE-2021-28688

 

Published at: - 06-04-2021 09:15

Last modified: - 26-10-2022 01:44

Total changes: - 6

Description

The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up. The lack of cleanup would result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. All Linux versions having the fix for XSA-365 applied are vulnerable. XSA-365 was classified to affect versions back to at least 3.11.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://xenbits.xenproject.org/xsa/advisory-371.txt
• [debian-lts-announce] 20210623 [SECURITY] [DLA 2690-1] linux-4.19 security update-Third Party Advisory
• [debian-lts-announce] 20210623 [SECURITY] [DLA 2689-1] linux security update-Third Party Advisory

 

Keywords

NVD

 

CVE-2021-28688

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures