NULL Pointer Dereference Vulnerability in Linux Kernel - Impacting Debian Linux Packages
Summary
DEBIAN-CVE-2018-12928: In the Linux kernel 4.15.0, a NULL pointer dereference was discovered in hfs_ext_read_extent in hfs.ko. Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Linux kernel is the core component of the Debian operating system, responsible for managing hardware and system resources. It provides essential services for all other parts of the operating system and is crucial for system stability and performance. The kernel is modular, allowing for various functionalities to be added or removed as needed. However, vulnerabilities in the kernel can lead to severe security risks, including system crashes and unauthorized access.
Vulnerability Detail
In the Linux kernel version 4.15.0, a NULL pointer dereference was identified in the function hfs_ext_read_extent within the hfs.ko module. This vulnerability can be triggered when a crafted HFS filesystem is mounted, potentially leading to a system crash or denial of service. The issue arises from improper handling of pointers, which can result in the kernel attempting to access memory that has not been allocated, causing instability and security concerns.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
As a temporary workaround, users should avoid mounting HFS filesystems that are untrusted or potentially crafted to exploit this vulnerability. Additionally, consider using alternative filesystem types that do not exhibit this issue.
Conclusion
The NULL pointer dereference vulnerability in the Linux kernel poses significant risks to Debian systems. It is crucial for users to update their Linux packages to the latest versions to mitigate these risks. By following the recommended steps and utilizing tools like Vulert, users can enhance their security posture and protect their systems from potential threats.
See every vulnerability recorded for linux →
FAQ
A NULL pointer dereference occurs when a program attempts to access memory at a location that has not been assigned, leading to crashes or unexpected behavior.
You can utilize Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failing to address this vulnerability can lead to system crashes, denial of service, and potential exploitation by malicious actors.
Yes, updating to the latest version of the Linux kernel will ensure that the vulnerability is patched and your system is secure.
Yes, using Vulert, you can monitor and receive alerts for open-source vulnerabilities in your software by simply using a manifest file like package-lock.json.
References
Related vulnerabilities
Recent vulnerabilities recorded for linux.
