CVE-2021-22543 Improper memory handling in Linux KVM
Improper memory handling in Linux KVM allows local attackers to read/write random memory pages, leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-22543?
CVE-2021-22543 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 26 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-119
Which versions are affected by CVE-2021-22543?
It affects 13 products.
Linux distribution packages (21)
redhat-virtualization-host Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3.19-20211013.0.el7_9 |
redhat-virtualization-host-image-update Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3.19-20211013.0.el7_9 |
kernel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-abi-whitelists Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-debug Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-debug-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-debug-devel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-debuginfo-common-i686 Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-debuginfo-common-s390x Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-devel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-doc Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-firmware Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-kdump Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-kdump-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
kernel-kdump-devel Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
perf Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
perf-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
python-perf Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
python-perf-debuginfo Red Hat:rhel_els:6 | All versions | 0:2.6.32-754.48.1.el6 |
Products include Debian Debian Linux, Fedoraproject Fedora, Linux kernel, Netapp Cloud Backup, Netapp H300e Firmware, Netapp H300s Firmware and 7 more.
How do I fix CVE-2021-22543?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-22543 being exploited?
There is no known exploitation of CVE-2021-22543 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as CLSA-2022-1659017902, CLSA-2022-1659018147, CLSA-2022-1669850228, CLSA-2022-1669919330, DEBIAN-CVE-2021-22543, RHSA-2021:3943 and 2 more.