Critical Vulnerability in Linux Kernel: Mutex to Spinlock Transition in irqfd_wakeup
Summary
DEBIAN-CVE-2024-44957: In the Linux kernel, the following vulnerability has been resolved: xen: privcmd: Switch from mutex to spinlock for irqfds irqfd_wakeup() gets EPOLLHUP, when it is called by eventfd_release() by way of wake_up_poll(&ctx-... Affects linux versions < 6.10.6-1. Fixed in 6.10.6-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware management and system resources. It is known for its robustness and flexibility, supporting a wide range of hardware architectures. However, like any complex software, it is susceptible to vulnerabilities that can affect system stability and security. This specific vulnerability relates to the handling of interrupt request file descriptors (irqfds) in the Xen hypervisor, which can lead to potential deadlocks under certain conditions.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the handling of irqfds within the Xen hypervisor. The issue arises from the use of a mutex in the irqfd_wakeup() function, which can lead to a deadlock when called by eventfd_release(). This occurs because the wake_up_poll function is invoked under spin_lock_irqsave(), making the use of a mutex inappropriate. The vulnerability can result in system instability and hinder the proper functioning of applications relying on irqfds.
How To Fix
Minimum fixed version
6.10.6-1
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
Currently, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the patch by updating to the fixed version of the Linux kernel.
Conclusion
The vulnerability identified in the Linux kernel regarding the transition from mutex to spinlock in irqfd_wakeup poses significant risks to system stability. Users are strongly encouraged to update to the patched version to ensure their systems remain secure and functional.
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FAQ
The vulnerability involves a transition from using a mutex to a spinlock in the irqfd_wakeup function, which can lead to deadlocks.
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If exploited, this vulnerability can lead to system instability and hinder the operation of applications that depend on irqfds.
Yes, the vulnerability has been patched in version 6.10.6-1 of the Linux kernel.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risks associated with this vulnerability.
References
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