Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
Vulnerability DatabaseCVE-2022-49147
CVE-2022-49147:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49147 is a vulnerability discovered in the Linux kernel's block subsystem. The issue relates to the handling of minor values in the blkallocext_minor() function. The vulnerability was disclosed and resolved in early 2022, affecting the Linux kernel's block device management system (Kernel Git).
Technical details
The vulnerability stems from an implementation flaw in the blkallocextminor() function where idaallocrange(..., min, max, ...) returns values from min to max inclusive. The issue occurs because NREXTDEVT is a valid idx returned by blkallocextminor(), and when this value is used in deviceadddisk() with the expression ddev->devt = MKDEV(disk->major, disk->firstminor), it could cause an overflow since NREXT_DEVT is defined as (1 << MINORBITS) (Kernel Git).
Impact
If exploited, this vulnerability could lead to an overflow condition when handling block device minor numbers in the Linux kernel. This could potentially affect system stability and block device management (NVD).
Mitigation and workarounds
The issue has been fixed by modifying the maximum value in idaallocrange to NREXTDEVT - 1, preventing the potential overflow condition. The fix was implemented through a patch in the Linux kernel (Kernel Git).
Additional resources
Source: This report was generated using AI
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