Vulnerability in Kernel: Put LLD module refcnt after SCSI device is released
Summary
GSD-2021-1001967: scsi: core: Put LLD module refcnt after SCSI device is released. Affects Kernel versions < 61a0faa89f21861d1f8d059123b5c285a5d9ffee. 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 interfaces with hardware devices. It manages the communication between software and hardware, including handling input/output operations. The SCSI (Small Computer System Interface) subsystem is responsible for managing SCSI devices, such as hard drives and tape drives, connected to the system. The LLD (Low-Level Driver) module is a component of the SCSI subsystem that provides the necessary functionality to interact with specific SCSI devices. This vulnerability in the Kernel's SCSI core affects the handling of the LLD module reference count after a SCSI device is released.
Vulnerability Detail
The vulnerability arises from a flaw in the SCSI core of the Kernel, where the LLD module reference count is not properly managed after a SCSI device is released. This can lead to a use-after-free condition, where the Kernel may attempt to access the LLD module after it has been freed from memory. 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. Users are advised to update their Kernel to the fixed version as soon as possible.
Conclusion
The vulnerability in the Kernel's SCSI core, which improperly manages the LLD module reference count after a SCSI device is released, has been addressed in the latest version of the Linux Kernel. Users are advised to update their Kernel to the fixed version to mitigate the risk of exploitation. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that provides core functionality and interfaces with hardware devices.
The SCSI subsystem is responsible for managing SCSI devices, such as hard drives and tape drives, connected to the system.
The LLD (Low-Level Driver) module is a component of the SCSI subsystem that provides the necessary functionality to interact with specific SCSI devices.
A use-after-free vulnerability occurs when a program attempts to access memory that has already been freed. This can lead to crashes, data corruption, or the execution of arbitrary code.
An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition.
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