net_sched: NULL dereference in fifo_set_limit()
Summary
GSD-2021-1001581: net_sched: fix NULL deref in fifo_set_limit(). Affects Kernel versions >= fb0305ce1b03f6ff17f84f2c63daccecb45f2805, < c951a3be5e8803e93bb49a0aca0d30457d3c1b67. No fix is published. How to fix ↓
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Background
The net_sched package is a component of the Linux Kernel that provides network scheduling functionality. It is responsible for managing the queuing and prioritization of network traffic. The fifo_set_limit() function within net_sched is used to set the limit for a First-In-First-Out (FIFO) queue. This vulnerability in the function can lead to a NULL dereference, potentially causing a system crash or other unexpected behavior.
Vulnerability Detail
The vulnerability occurs in the fifo_set_limit() function of net_sched. When a NULL pointer is passed as an argument to this function, it does not handle the NULL pointer correctly, resulting in a NULL dereference. An attacker could potentially exploit this vulnerability by passing a crafted argument to the function, causing a crash or triggering other unintended consequences. 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.
Conclusion
The net_sched package in the Linux Kernel is vulnerable to a NULL dereference in the fifo_set_limit() function. This vulnerability has been fixed in Linux Kernel version v5.4.153. Users are advised to update their Linux Kernel to at least this version to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
net_sched is a component of the Linux Kernel that provides network scheduling functionality. It manages the queuing and prioritization of network traffic.
fifo_set_limit() is a function within net_sched that is used to set the limit for a First-In-First-Out (FIFO) queue.
A NULL dereference occurs when a program attempts to access or manipulate memory using a NULL pointer, which does not point to a valid memory location. This can lead to crashes or other unexpected behavior.
An attacker could potentially exploit this vulnerability by passing a crafted argument to the fifo_set_limit() function, causing a crash or triggering other unintended consequences.
No, the impact and attack plausibility of this vulnerability have not been proven yet.
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