Critical UAF Vulnerability in Linux Kernel - CVE-2026-46242
Summary
DEBIAN-CVE-2026-46242: In the Linux kernel, the following vulnerability has been resolved: eventpoll: fix ep_remove struct eventpoll / struct file UAF ep_remove() (via ep_remove_file()) cleared file->f_ep under file->f_lock but then kept using... Affects linux versions 6.12.38-1 – 7.1~rc5-1~exp1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its robustness and flexibility, supporting a wide range of devices and architectures. However, vulnerabilities can arise, such as CVE-2026-46242, which affects the eventpoll subsystem, potentially leading to serious security issues.
Vulnerability Detail
CVE-2026-46242 is a use-after-free (UAF) vulnerability in the Linux kernel's eventpoll implementation. It occurs when the ep_remove function clears the file's eventpoll reference while still using the file pointer within a critical section. This can lead to a race condition where a concurrent operation may free the memory associated with the file, allowing an attacker to manipulate memory and execute arbitrary code. The vulnerability is particularly dangerous as it can lead to memory corruption and system instability.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the patch as soon as it becomes available.
Conclusion
CVE-2026-46242 is a critical vulnerability in the Linux kernel that poses significant risks to system security. It is essential to stay informed about such vulnerabilities and apply patches promptly to ensure the integrity of your systems. Utilizing tools like Vulert can help in monitoring and managing these vulnerabilities effectively.
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FAQ
CVE-2026-46242 is a use-after-free vulnerability in the Linux kernel's eventpoll subsystem that can lead to memory corruption and potential code execution.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
The risks include potential memory corruption, system instability, and the possibility of an attacker executing arbitrary code on the affected system.
Yes, a patch is available in the fixed version 7.0.10-1 for Debian 14. It is crucial to update your system to this version to mitigate the vulnerability.
While there are no specific workarounds, it is advisable to monitor your system closely and apply the patch as soon as possible to reduce the risk of exploitation.
References
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