SB2021032637 - Privilege escalation in Linux kernel VDPA
Published: March 26, 2021 Updated: February 7, 2022
Security Bulletin ID
SB2021032637
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2021-29266)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in drivers/vhost/vdpa.c, because "v->config_ctx" has an invalid value upon re-opening a character device. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.