Vulnerability in s390/zcrypt: zcard and zqueue hot-unplug memleak
Summary
GSD-2021-1000123: s390/zcrypt: fix zcard and zqueue hot-unplug memleak. Affects Kernel versions >= 29c2680fd2bf3862ff5cf2957f198512493156f9, < 055a063a18bcd19b93709e3eac8078d6b2f04599. No fix is published. How to fix ↓
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Background
The s390/zcrypt package is a component of the Linux Kernel that provides cryptographic support for IBM System z hardware. It includes drivers and interfaces for managing cryptographic cards (zcards) and cryptographic queues (zqueues). These components are responsible for offloading cryptographic operations to dedicated hardware, improving performance and security. However, a vulnerability has been discovered in the hot-unplug process of zcards and zqueues, leading to a memory leak.
Vulnerability Detail
The vulnerability in s390/zcrypt occurs during the hot-unplug process of zcards and zqueues. When these components are hot-unplugged, a memory leak can occur, resulting in the gradual depletion of system resources. This can lead to performance degradation and potentially allow an attacker to exhaust system memory, causing a denial of service (DoS) condition. The vulnerability was introduced in Linux Kernel version v5.10 and has been fixed in version v5.11.20.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No workaround has been provided for this vulnerability. It is essential to update the Linux Kernel to the fixed version to mitigate the risk of memory leaks during the hot-unplug process of zcards and zqueues.
Conclusion
The vulnerability in s390/zcrypt, specifically in the hot-unplug process of zcards and zqueues, can lead to memory leaks and potential denial of service (DoS) attacks. It is crucial to update the Linux Kernel to version v5.11.20 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
s390/zcrypt is a component of the Linux Kernel that provides cryptographic support for IBM System z hardware. It includes drivers and interfaces for managing cryptographic cards (zcards) and cryptographic queues (zqueues).
The vulnerability can lead to a memory leak during the hot-unplug process of zcards and zqueues. This can result in performance degradation and potentially allow an attacker to exhaust system memory, causing a denial of service (DoS) condition.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.11.20 or later. This update includes the necessary patch to address the memory leak issue during the hot-unplug process of zcards and zqueues.
No workaround has been provided for this vulnerability. It is essential to update the Linux Kernel to the fixed version to mitigate the risk of memory leaks during the hot-unplug process of zcards and zqueues.
Users can obtain the updated Linux Kernel from the official Linux Kernel repository.
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