Vulnerability in Kernel: mm, slub - Mismatch Between Freelist Depth and cnt
Summary
GSD-2021-1001799: mm, slub: fix mismatch between reconstructed freelist depth and cnt. Affects Kernel versions >= c3895391df385c6628638f014c87e16f5e2efd45, < 21e23e4c02fc9aa1f4b037f30e47d215d1a27f21. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functions for memory management, process scheduling, and device drivers. The mm (memory management) subsystem within the Kernel is responsible for allocating and managing memory resources. Within mm, the slub (slab allocator) is a memory allocation subsystem that optimizes memory usage by grouping objects of similar sizes into slabs. However, a vulnerability has been identified in the slub subsystem that causes a mismatch between the reconstructed freelist depth and the cnt (count) value. This mismatch can lead to memory corruption and potential security vulnerabilities.
Vulnerability Detail
The vulnerability in the slub subsystem arises from a mismatch between the reconstructed freelist depth and the cnt value. This discrepancy can occur when the freelist is modified concurrently by multiple threads, leading to inconsistent state and potential memory corruption. An attacker could potentially exploit this vulnerability to gain unauthorized access, execute arbitrary code, or cause a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the security and stability of the system.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
No specific workaround has been provided for this vulnerability. It is advisable to apply the official fix by updating the Linux Kernel to the recommended version.
Conclusion
The vulnerability in the Kernel's mm, slub subsystem can result in memory corruption and potential security risks. It is crucial to update the Linux Kernel to the recommended version to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software.
The mm (memory management) subsystem in the Kernel is responsible for allocating and managing memory resources.
The slub (slab allocator) is a memory allocation subsystem within the mm subsystem that optimizes memory usage by grouping objects of similar sizes into slabs.
The impact of this vulnerability can include memory corruption, unauthorized access, arbitrary code execution, or denial-of-service conditions.
To fix this vulnerability, update the Linux Kernel to version v4.19.214 or later using the official Linux Kernel repository.
Related vulnerabilities
Recent vulnerabilities recorded for Kernel.
