Critical Vulnerability in Linux Kernel Packages: CVE-2015-0239
Summary
UBUNTU-CVE-2015-0239: The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel before 3.18.5, when the guest OS lacks SYSENTER MSR initialization, allows guest OS users to gain guest OS privileges or cause a denial of service (g... Affects linux versions < 3.13.0-46.75. Fixed in 3.13.0-46.75. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to applications. It supports a wide range of functionalities, including process management, memory management, and device drivers. The vulnerability CVE-2015-0239 affects specific versions of the Linux kernel packages, particularly those used in Ubuntu 14.04 LTS, which can lead to privilege escalation or denial of service.
Vulnerability Detail
The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel before version 3.18.5, when the guest operating system lacks SYSENTER MSR initialization, allows users of the guest OS to gain elevated privileges or cause a denial of service by triggering the use of a 16-bit code segment for emulation of a SYSENTER instruction. This vulnerability can be exploited by malicious users within the guest OS, leading to potential system crashes or unauthorized access.
How To Fix
Minimum fixed version
3.13.0-46.75
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can limit access to the guest OS or disable the use of SYSENTER instructions until the system can be updated. However, this may not be feasible in all environments and should be considered a stopgap measure.
Conclusion
The CVE-2015-0239 vulnerability in the Linux kernel poses serious risks, including privilege escalation and denial of service. Users are strongly advised to update their kernel packages to the latest patched versions to mitigate these risks. Regular updates and monitoring for vulnerabilities are essential for maintaining system security.
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FAQ
CVE-2015-0239 is a vulnerability in the Linux kernel that allows users of a guest operating system to gain elevated privileges or cause a denial of service.
The vulnerability affects Linux kernel versions prior to 3.18.5, specifically in Ubuntu 14.04 LTS.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
Exploitation of this vulnerability can lead to unauthorized access, privilege escalation, or system crashes, posing significant security risks.
It is recommended to regularly check for updates and apply them promptly to ensure your system is protected against known vulnerabilities.
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