Sleeping Function Called from Invalid Context in isdn: mISDN
Summary
UVI-2021-1002185: isdn: mISDN: Fix sleeping function called from invalid context. Affects Kernel versions < 6510e80a0b81b5d814e3aea6297ba42f5e76f73c. No fix is published. How to fix ↓
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Background
The isdn package is a part of the Linux Kernel ecosystem and is responsible for handling Integrated Services Digital Network (ISDN) protocols. It provides support for ISDN devices and allows communication over ISDN lines. The mISDN subsystem within the isdn package is specifically responsible for managing ISDN hardware and software components.
The vulnerability identified in the mISDN subsystem involves a sleeping function being called from an invalid context.
Vulnerability Detail
The vulnerability arises when a sleeping function is invoked from an invalid context within the mISDN subsystem. This can lead to various issues, including system crashes, resource leaks, and potential privilege escalation. An attacker may be able to exploit this vulnerability to execute arbitrary code or disrupt the normal operation of the system.
The vulnerability has been assigned the ID UVI-2021-1002185 and has been fixed in the Linux Kernel version v5.15 by commit 6510e80a0b81b5d814e3aea6297ba42f5e76f73c.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been provided for this vulnerability.
Conclusion
The vulnerability in the isdn: mISDN package, which involves a sleeping function being called from an invalid context, can have serious consequences such as system crashes, resource leaks, and potential privilege escalation. It is crucial to update the Linux Kernel to version v5.15 or later to mitigate this vulnerability. If you require further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
The vulnerability can potentially lead to system crashes, resource leaks, and privilege escalation. It may also allow attackers to execute arbitrary code or disrupt the normal operation of the system.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze the dependencies and alert you if any vulnerabilities, including this one, are found.
At the time of this report, no known exploits for this vulnerability have been disclosed. However, it is important to apply the fix as soon as possible to mitigate any potential risks.
The exact conditions for remote exploitation of this vulnerability are not specified. However, given the nature of the vulnerability, it is advisable to assume that remote exploitation is possible, especially if the affected system is exposed to untrusted networks.
For more details about this vulnerability, including the specific code changes that fix it, you can refer to the source provided by the Cloud Security Alliance's GSD Database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1002xxx/UVI-2021-1002185.json).
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