Use-after-free vulnerability in watchdog package
Summary
UVI-2021-1001269: watchdog: Fix possible use-after-free by calling del_timer_sync(). Affects Kernel versions < 66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4. No fix is published. How to fix ↓
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Background
The watchdog package is a component of the Linux Kernel, which is responsible for monitoring the system and ensuring its stability. It includes a timer mechanism that periodically checks for system responsiveness. However, a use-after-free vulnerability has been identified in the watchdog package, which could potentially lead to system instability or crashes.
Vulnerability Detail
The use-after-free vulnerability in the watchdog package arises from a flaw in the code that handles timers. Specifically, the function del_timer_sync() is not called correctly, resulting in a potential use of a timer after it has been freed. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven yet.
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. However, applying the recommended fix by updating the Linux Kernel to the latest version is the best course of action.
Conclusion
In conclusion, the use-after-free vulnerability in the watchdog package of the Linux Kernel can be addressed by updating to version v5.10.52 or later. This fix ensures the proper handling of timers and mitigates the potential risks associated with the vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The watchdog package is a component of the Linux Kernel that monitors the system and ensures its stability.
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed, which can lead to unpredictable behavior or security issues.
The impact of this vulnerability could range from system instability to potential execution of arbitrary code or denial-of-service attacks.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.52 or later.
There is no specific workaround mentioned for this vulnerability. Updating the Linux Kernel is the recommended solution.
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