CVE-2021-47432: 
Linux Kernel vulnerability analysis and mitigation

CVE-2021-47432 affects the Linux kernel's generic radix tree implementation. The vulnerability was discovered when new inode numbers were being spread throughout the 64-bit inode space, which triggered corner case bugs related to integer overflows in the radix tree code. The issue specifically resides in the lib/generic-radix-tree.c file's peek() function (Kernel Git).

The vulnerability is caused by an integer overflow condition in the generic radix tree implementation. The issue occurs in the peek() function within lib/generic-radix-tree.c when handling large inode numbers. According to CISA's assessment, this vulnerability has been assigned a CVSS v3.1 Base Score of 5.5 (Medium) with the vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).

The vulnerability can lead to integer overflow conditions when handling large inode numbers in the Linux kernel's radix tree implementation. This could potentially result in system instability or denial of service conditions when accessing file system resources (Kernel Git).

The vulnerability has been patched in the Linux kernel. The fix involves adding proper overflow checks in the peek() function and handling edge cases when dealing with large inode numbers. The patch modifies both include/linux/generic-radix-tree.h and lib/generic-radix-tree.c files to implement proper bounds checking and overflow prevention (Kernel Git).