Red Hat Enterprise Linux 7.6 update for kernel



Published: 2021-11-23 | Updated: 2021-12-06
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-36385
CWE-ID CWE-416
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Operating systems & Components / Operating system package or component

kernel (Red Hat package)
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server - TUS
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server - AUS
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU58332

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-36385

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 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions: 7.6

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions: 7.6

Red Hat Enterprise Linux Server - TUS: 7.6

Red Hat Enterprise Linux Server - AUS: 7.6

kernel (Red Hat package): before 3.10.0-957.86.1.el7


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:4770

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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