SIGTRAP Handling Improvement in Linux Kernel - CVE-2022-49782
Summary
CVE-2022-49782: In the Linux kernel, the following vulnerability has been resolved: perf: Improve missing SIGTRAP checking To catch missing SIGTRAP we employ a WARN in perf_event_overflow(), which fires if pending_sigtrap was already se... Affects linux versions < 6.0.10-1. Fixed in 6.0.10-1. 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 control. The kernel is critical for system stability and performance. CVE-2022-49782 highlights a specific vulnerability related to the handling of SIGTRAP signals during performance event overflows, which can lead to unexpected behavior in user space applications.
Vulnerability Detail
CVE-2022-49782 is a vulnerability in the Linux kernel that arises from inadequate checking for pending SIGTRAP signals during performance event overflows. The issue occurs in the __perf_event_overflow() function, where a WARN is triggered if pending_sigtrap is set but not consumed. This can lead to a scenario where an event fires before the interrupt handler processes the pending SIGTRAP, potentially causing the kernel to re-enter without proper user space progress. The vulnerability can result in system instability and unexpected behavior in applications relying on performance monitoring.
How To Fix
Minimum fixed version
6.0.10-1
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 mentioned for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate the risk.
Conclusion
CVE-2022-49782 is a significant vulnerability in the Linux kernel that affects the handling of SIGTRAP signals during performance event overflows. It is crucial to update to the patched version to ensure system stability and prevent unexpected behavior in applications. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
CVE-2022-49782 is a vulnerability in the Linux kernel related to the handling of SIGTRAP signals during performance event overflows.
The vulnerability can lead to system instability and unexpected behavior in applications that rely on performance monitoring, potentially affecting system performance.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. You can check if your application is affected by this vulnerability using the Vulert playground without any signup.
Update your Linux package to version 6.0.10-1 or later to apply the patch that resolves this vulnerability.
Currently, there are no specific workarounds available. It is advisable to apply the patch as soon as possible.
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