KVM: X86: Fix x86_emulator slab cache leak
Summary
GSD-2021-1000999: KVM: X86: Fix x86_emulator slab cache leak. Affects Kernel versions >= c9b8b07cded58c55ad2bf67e68b9bfae96092293, < 3a9934d6b8dd8a91d61ed2d0d538fa27cb9192a3. No fix is published. How to fix ↓
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Background
The Kernel package is a crucial component of the Linux operating system. It provides the core functionality and interfaces for the system's hardware and software components. KVM (Kernel-based Virtual Machine) is a module within the Kernel that allows running virtual machines on Linux. The x86_emulator is a component of KVM that emulates x86 instructions. This vulnerability in the x86_emulator module can lead to a slab cache leak, potentially impacting the stability and performance of virtual machines running on the system.
Vulnerability Detail
The vulnerability in the x86_emulator module of KVM can result in a slab cache leak. A slab cache is a type of memory cache used by the Linux Kernel to efficiently manage memory allocations. A leak in the slab cache can cause memory exhaustion, leading to system instability and performance degradation. An attacker may be able to exploit this vulnerability to exhaust system resources, potentially resulting in a denial-of-service (DoS) condition. The issue was introduced in version v5.7 of the Linux Kernel and has been fixed in version v5.10.46.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel to the patched version.
Conclusion
The vulnerability in the x86_emulator module of KVM can lead to a slab cache leak, potentially causing memory exhaustion and system instability. It is recommended to update the Linux Kernel to version v5.10.46 or later to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The vulnerability can lead to a slab cache leak, potentially causing memory exhaustion and system instability. It may also be exploited by attackers to trigger a denial-of-service (DoS) condition.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities.
There is no known exploit for this vulnerability at the time of this report. However, it is important to apply the fix to prevent potential exploitation.
The recommended approach is to update the Linux Kernel to the patched version. There is no specific mitigation mentioned for this vulnerability.
You can refer to the vulnerability details in the GSD database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000999.json) for more information.
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