SB2023040456 - Red Hat Enterprise Linux 8.6 Extended Update Support update for kernel

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Main Vulnerability Database SB2023040456

SB2023040456 - Red Hat Enterprise Linux 8.6 Extended Update Support update for kernel

Published: April 4, 2023 Updated: June 17, 2025

Security Bulletin ID SB2023040456
Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

High 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2023-0266)

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

The vulnerability exists due to a use-after-free error within the snd_ctl_elem_read() function in the Linux kernel sound subsystem. A local user can trigger a use-after-free error and execute arbitrary code on the system.

Note, the vulnerability is being actively exploited in the wild.


2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2023-0386)

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

The vulnerability exists due to unauthorized access to execution of setuid files in OverlayFS subsystem when copying a capable file from a nosuid mount into another mount. A local user can execute arbitrary code with root privileges.


Remediation

Install update from vendor's website.

References