SB2022042013 - Red Hat Enterprise Linux 6 Extended Lifecycle Support update for kernel
Published: April 20, 2022 Updated: December 13, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2021-0920)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the unix_scm_to_skb() function of af_unix.c in Linux kernel. A local user can run a specially crafted program to trigger a race condition and execute arbitrary code with elevated privileges.
2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-0466)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to unspecified error, related to I/O subsystem in kernel. A local user can elevated privileges on the system.
3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-4155)
The vulnerability allows a local user to bypass implemented security restrictions.
The vulnerability exists due to the OS kernel does not impose correctly security restrictions. A local user can gain access to sensitive information on the system.
4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-0492)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a logic error within the cgroup_release_agent_write() function in kernel/cgroup/cgroup-v1.c. A local user can use the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation.
Remediation
Install update from vendor's website.