SB2021063015 - Red Hat Enterprise Linux 8 update for kernel-rt 

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Main Vulnerability Database SB2021063015

SB2021063015 - Red Hat Enterprise Linux 8 update for kernel-rt

Published: June 30, 2021

Security Bulletin ID SB2021063015
Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Protection Mechanism Failure (CVE-ID: CVE-2020-26541)

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

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c. A local user can escalate privileges on the system.


2) Use-after-free (CVE-ID: CVE-2021-33034)

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

The vulnerability exists due to a use-after-free error in net/bluetooth/hci_event.c when destroying an hci_chan. A local user can escalate privileges on the system.



Remediation

Install update from vendor's website.

References