Red Hat Enterprise Linux 6 Extended Lifecycle Support update for kernel



Published: 2022-07-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-22543
CWE-ID CWE-119
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		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 one low risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU56018

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-22543

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in Linux kernel when handling VM_IO|VM_PFNMAP vmas in KVM. A local user can  can bypass RO checks and cause the pages to get freed while still accessible by the VMM and guest. As a result, an attacker with the ability to start and control a VM to read/write random pages of memory, can trigger memory corruption 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 - 2.6.32-754.47.1.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-2022:5640

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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