Vulnerability in Kernel: crypto: cryptd - Protect per-CPU resource by disabling BH
Summary
GSD-2022-1003578: crypto: cryptd - Protect per-CPU resource by disabling BH. Affects Kernel versions >= 254eff771441f4ee7aa9cf770a6e4820492c9dab, < 76badb0a4d941cfdf9b68b6ebef45da7b1fd6770. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionality and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the security and stability of the system. One of the components in the Kernel is the crypto subsystem, which provides cryptographic algorithms and services. Within the crypto subsystem, the cryptd module is responsible for offloading cryptographic operations to dedicated hardware or software accelerators. However, a vulnerability has been discovered in the cryptd module that can potentially lead to security issues.
Vulnerability Detail
The vulnerability in the cryptd module arises from a lack of protection for per-CPU resources. By disabling the bottom half (BH) mechanism, which handles deferred work in the Kernel, an attacker could potentially gain unauthorized access to per-CPU resources and manipulate them for malicious purposes. The impact and attack plausibility of this vulnerability have not been proven yet, but it poses a potential risk to the security and integrity of the system. The vulnerability was introduced in version v2.6.30 of the Linux Kernel and has been fixed in version v5.10.121.
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.
Conclusion
The vulnerability in the cryptd module of the Kernel poses a potential risk to the security and integrity of the system. It is recommended to update the Linux Kernel to version v5.10.121 or later to fix this vulnerability. For further support and assistance in vulnerability remediation, you can contact DevNack.com.
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FAQ
The cryptd module in the Kernel is responsible for offloading cryptographic operations to dedicated hardware or software accelerators. It helps improve the performance and efficiency of cryptographic operations in the system.
The exact exploitation method for this vulnerability has not been proven yet. However, by gaining unauthorized access to per-CPU resources, an attacker could potentially manipulate them for malicious purposes, compromising the security and integrity of the system.
The impact of this vulnerability is not yet known. It depends on the attack vector and the specific actions an attacker can perform with unauthorized access to per-CPU resources. However, it has the potential to lead to security breaches and compromise the overall system integrity.
Yes, this vulnerability has been fixed in version v5.10.121 of the Linux Kernel. Users are advised to update their Kernel to this version or later to ensure the protection of per-CPU resources in the cryptd module.
For more information about this vulnerability, you can refer to the source link provided in the database_specific section of the vulnerability details.
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