SB2020120225 - Information disclosure in KDGKBSENT and KDSKBSENT IOCTLs in Linux kernel
Published: December 2, 2020 Updated: March 18, 2021
Security Bulletin ID
SB2020120225
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2020-25656)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to a use-after-free error in the way the console subsystem uses KDGKBSENT and KDSKBSENT IOCTLs. A local user can run a specially crafted program to trigger an out-of-bounds read and gain access to sensitive information.
Remediation
Install update from vendor's website.