Red Hat Enterprise Linux 6 Extended Lifecycle Support update for kernel



Published: 2022-04-20 | Updated: 2022-08-28
Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2021-0920
CVE-2020-0466
CVE-2021-4155
CVE-2022-0492
CWE-ID CWE-416
CWE-264
Exploitation vector Local
Public exploit Vulnerability #1 is being exploited in the wild.
Public exploit code for vulnerability #4 is available.
Vulnerable software
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kernel (Red Hat package)
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server - Extended Life Cycle Support
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU59811

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-0920

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 2.6.32-71.7.1.el6 - 2.6.32-754.43.1.el6

Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems): 6.0

Red Hat Enterprise Linux Server - Extended Life Cycle Support: 6.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2022:1417

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU52033

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-0466

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 2.6.32-71.7.1.el6 - 2.6.32-754.43.1.el6

Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems): 6.0

Red Hat Enterprise Linux Server - Extended Life Cycle Support: 6.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2022:1417

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU59812

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-4155

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 2.6.32-71.7.1.el6 - 2.6.32-754.43.1.el6

Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems): 6.0

Red Hat Enterprise Linux Server - Extended Life Cycle Support: 6.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2022:1417

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

4) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU61245

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2022-0492

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 2.6.32-71.7.1.el6 - 2.6.32-754.43.1.el6

Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems): 6.0

Red Hat Enterprise Linux Server - Extended Life Cycle Support: 6.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2022:1417

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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