SB2020121127 - Fedora 33 update for kernel

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Main Vulnerability Database SB2020121127

SB2020121127 - Fedora 33 update for kernel

Published: December 11, 2020 Updated: April 25, 2025

Security Bulletin ID SB2020121127
Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Improper locking (CVE-ID: CVE-2020-29660)

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to double-locking error in drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c. An authenticated local user can exploit this vulnerability to perform a read-after-free attack against TIOCGSID and gain access to sensitive information.


2) Improper locking (CVE-ID: CVE-2020-29661)

The vulnerability allows a local user to perform a escalate privileges on the system.

The vulnerability exists due to locking error in the tty subsystem of the Linux kernel in drivers/tty/tty_jobctrl.c. An local user can exploit this vulnerability to trigger a use-after-free error against TIOCSPGRP and execute arbitrary code with elevated privileges.


Remediation

Install update from vendor's website.

References