Vulnerability in Kernel package: x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails
Summary
GSD-2021-1002278: x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails. Affects Kernel versions >= 93286261de1b46339aa27cd4c639b21778f6cade, < 9c177eee116cf888276d3748cb176e72562cfd5c. 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 acts as an interface between the hardware and software layers. The x86/hyperv module within the Kernel package is responsible for handling interactions with the Hyper-V hypervisor, which is a virtualization technology used in Windows systems. This vulnerability specifically affects the set_hv_tscchange_cb() function within the x86/hyperv module.
Vulnerability Detail
The vulnerability arises when the Hyper-V setup fails, leading to a NULL dereference in the set_hv_tscchange_cb() function. This can result in a system crash or other unpredictable behavior. An attacker may potentially exploit this vulnerability to cause a denial-of-service (DoS) attack or gain elevated privileges. The vulnerability was introduced in version v4.16 of the Linux Kernel and has been fixed in version v5.10.82.
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 Kernel package's x86/hyperv module can lead to system crashes and potential security risks. It is crucial to update the Linux Kernel to version v5.10.82 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a system crash or other unpredictable behavior. It may also be exploited by attackers to cause a denial-of-service (DoS) attack or gain elevated privileges.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will provide real-time alerts for open-source vulnerabilities.
Yes, a patch has been released in version v5.10.82 of the Linux Kernel. It is recommended to update to this version or a later one to fix the vulnerability.
The exact attack vectors for this vulnerability have not been proven. However, if an attacker can trigger the Hyper-V setup failure remotely, they may be able to exploit the vulnerability.
There are no known instances of this vulnerability being exploited in the wild. However, it is always recommended to apply security patches promptly to mitigate potential risks.
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