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CVE-2022-4139: HIGH-RISK VULNERABILITY IN LINUX KERNEL’S GPU I915 KERNEL DRIVER

by do son · November 30, 2022



A newly disclosed security vulnerability in the Linux kernel could be leveraged
by a local attacker to gain elevated privileges on vulnerable systems to execute
arbitrary code.

Tracked as CVE-2022-4139 (CVSS score: 7.0), the flaw impacts affected Linux
kernel stable branches (all since 5.4) and is a result of a security-sensitive
bug in the Linux kernel’s GPU i915 kernel driver.

The flaw resides incorrect GPU TLB flush code in the i915 kernel driver.
According to the seclists, “Depending on whether the GPU is running behind an
active IOMMU there are two possible scenarios which can happen, due to stale TLB
mapping:

1. Without IOMMU – GPU can still access physical memory which could be already
assigned by OS to different process.

2. With IOMMU – GPU can access any memory, if the malicious process is able to
create/reuse necessary IOMMU mappings.”



“An incorrect TLB flush issue was found in the Linux kernel’s GPU i915 kernel
driver, potentially leading to random memory corruption or data leaks. This flaw
could allow a local user to crash the system or escalate their privileges on the
system,” Red Hat said in an advisory published on November 30, 2022.

How to Fix the Video Driver Crashed...


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How to Fix the Video Driver Crashed Error on Windows 11/10

To successfully exploit this vulnerability, attackers need to have access to the
targeted system and run their exploit which leads to obtaining sensitive
information or causing random memory corruption.

All Intel integrated and discrete GPUs Gen12, including Tiger Lake, Rocket Lake,
Alder Lake, DG1, Raptor Lake, DG2, Arctic Sound, and Meteor Lake are vulnerable
to CVE-2022-4139.

A researcher has backported the patches to all affected stable branches to
address the issue, Red Hat Enterprise Linux, Ubuntu, CentOS, and Debian have not
implemented the changes and therefore, are vulnerable to the attacks. If you are
an advanced Linux user, apply the patch and rebuild the kernel yourself. OR, you
can wait for the next kernel update from your distro provider and apply it as
soon as possible.


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Tags: CVE-2022-4139Linux Kernel

 * Next story ADFSRelay: NTLM Relaying Attacks Targeting ADFS
 * Previous story CVE-2022-41325: VLC media player remote code execution
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