Divide-by-zero Vulnerability in iocost Package
Summary
GSD-2021-1002710: iocost: Fix divide-by-zero on donation from low hweight cgroup. Affects Kernel versions >= f1de2439ec43b74764f2a26e3a310b24407e3bde, < a7c80674538f15f85d68138240aae440b8039519. No fix is published. How to fix ↓
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Background
The iocost package is a component of the Linux Kernel, which is responsible for managing the input/output (I/O) costs of different processes. It ensures fair allocation of I/O resources among various cgroups. Cgroups are used to group processes and manage their resource usage. The iocost package calculates the I/O cost of each cgroup and distributes it accordingly. However, a vulnerability has been discovered in the iocost package that can lead to a divide-by-zero error when a donation is made from a low hweight cgroup.
Vulnerability Detail
The divide-by-zero vulnerability in the iocost package occurs when a donation is made from a low hweight cgroup. This can result in a divide-by-zero error, leading to a system crash or potential privilege escalation. An attacker could potentially exploit this vulnerability to crash the system or gain elevated privileges. The vulnerability was introduced in version v5.10 of the Linux Kernel and has been fixed in version v5.10.88.
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. The recommended approach is to update the Linux Kernel to the latest version.
Conclusion
The divide-by-zero vulnerability in the iocost package of the Linux Kernel can have serious consequences, including system crashes and potential privilege escalation. It is crucial to update the Linux Kernel to version v5.10.88 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The iocost package is a component of the Linux Kernel that manages the input/output costs of different processes and ensures fair allocation of I/O resources among cgroups.
A cgroup is a Linux kernel feature that allows grouping processes and managing their resource usage. It provides control over resources such as CPU, memory, and I/O.
A divide-by-zero error occurs when a program attempts to divide a number by zero, which is an undefined operation in mathematics. This can lead to crashes or unexpected behavior in software.
The divide-by-zero vulnerability in the iocost package can result in a system crash or potential privilege escalation. An attacker could exploit this vulnerability to crash the system or gain elevated privileges.
To protect your system, it is recommended to update the Linux Kernel to version v5.10.88 or later. This fix addresses the divide-by-zero error in the iocost package.
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