SB2023040455 - Red Hat Enterprise Linux 8 update for kernel-rt
Published: April 4, 2023 Updated: June 17, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Deadlock (CVE-ID: CVE-2022-4269)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an error in the Linux kernel Traffic Control (TC) subsystem. A local user can use a specific network configuration (redirecting egress packets to ingress using TC action "mirred") to trigger a CPU soft lockup.
2) Stack-based buffer overflow (CVE-ID: CVE-2022-4378)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the __do_proc_dointvec() function. A local user can trigger a stack-based buffer overflow and execute arbitrary code with elevated privileges.
3) 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.
4) 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.