SB2021091901 - Privilege escalation in Linux kernel io_uring

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2021091901

SB2021091901 - Privilege escalation in Linux kernel io_uring

Published: September 19, 2021 Updated: October 19, 2022

Security Bulletin ID SB2021091901
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Improper Privilege Management (CVE-ID: CVE-2021-41073)

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to improper privilege management within the loop_rw_iter() function in fs/io_uring.c in Linux kernel. A local user can escalate privileges on the system by using IORING_OP_PROVIDE_BUFFERS to trigger a free of a kernel buffer.


Remediation

Install update from vendor's website.

References