CVE-2021-22543 vulnerability in Linux and Other Products
Published on May 26, 2021

Improper memory handling in Linux KVM

An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.

Vendor Advisory Vendor Advisory NVD

Vulnerability Analysis

CVE-2021-22543 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.

Attack Vector:

LOCAL

Attack Complexity:

HIGH

Privileges Required:

LOW

User Interaction:

NONE

Weakness Type

What is a Buffer Overflow Vulnerability?

The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

CVE-2021-22543 has been classified to as a Buffer Overflow vulnerability or weakness.

Products Associated with CVE-2021-22543

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-22543 are published in these products:

Linux Kernel

Canonical Ubuntu Linux

Debian Linux

Fedora Project Fedora

NetApp Hci Baseboard Management Controller

NetApp Solidfire Baseboard Management Controller

NetApp Cloud Backup

NetApp Solidfire Baseboard Management Controller Firmware

Affected Versions

Linux Kernel:

Version add6a0cd1c5ba51b201e1361b05a5df817083618 and below f8be156be163a052a067306417cd0ff679068c97 is affected.

Exploit Probability

EPSS

0.66%

Percentile

48.90%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.