SB2021122819 - Privilege escalation in Linux kernel TEE subsystem
Published: December 28, 2021
Security Bulletin ID
SB2021122819
Severity
Low
Patch available
NO
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-2021-44733)
The vulnerability allows a local user to elevate privileges on the system.
The vulnerability exists due to a use-after-free error in the drivers/tee/tee_shm.c file within the TEE subsystem in the Linux kernel. A local user can trigger a race condition in tee_shm_get_from_id during an attempt to free a shared memory object and execute arbitrary code with elevated privileges.
Remediation
Cybersecurity Help is not aware of any official remediation provided by the vendor.