SB2021120121 - Red Hat Enterprise Linux 8.2 update for kernel 

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Main Vulnerability Database SB2021120121

SB2021120121 - Red Hat Enterprise Linux 8.2 update for kernel

Published: December 1, 2021 Updated: December 6, 2021

Security Bulletin ID SB2021120121
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) Improper Initialization (CVE-ID: CVE-2021-20317)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper initialization the Linux kernel. A corrupted timer tree causes the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. A local user can run a specially crafted application to crash the kernel.


2) Use-after-free (CVE-ID: CVE-2020-36385)

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

The vulnerability exists due to a use-after-free error in drivers/infiniband/core/ucma.c, because the ctx is reached via the ctx_list in some ucma_migrate_id situations where ucma_close is called. A local user can run a specially crafted program to trigger the use-after-free error and execute arbitrary code with elevated privileges.


Remediation

Install update from vendor's website.

References