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 |
redhat-virtualization-host (Red Hat package) Operating systems & Components / Operating system package or component redhat-release-virtualization-host (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Virtualization Host Web applications / Remote management & hosting panels Red Hat Virtualization Server applications / Virtualization software |
Vendor | Red Hat Inc. |
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU56018
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2021-22543
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe 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.
Install updates from vendor's website.
redhat-virtualization-host (Red Hat package): 4.3.11-20200922.0.el7_9 - 4.3.18-20210903.0.el7_9
redhat-release-virtualization-host (Red Hat package): 4.3.4-1.el7ev - 4.3.18-1.el7ev
Red Hat Virtualization Host: 4
Red Hat Virtualization: 4
http://access.redhat.com/errata/RHSA-2021:3943
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?