SB2021021621 - Error handling issues in blkback's grant mapping in Xen

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2021021621

SB2021021621 - Error handling issues in blkback's grant mapping in Xen

Published: February 16, 2021 Updated: March 21, 2021

Security Bulletin ID SB2021021621
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Resource management error (CVE-ID: CVE-2021-26930)

CWE-ID: CWE-399 - Resource Management Errors

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources when processing service requests to the PV backend within drivers/block/xen-blkback/blkback.c driver in Xen. A local user on the guest OS can perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References