CVE-2024-56692: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-56692 affects the Linux kernel's F2FS (Flash-Friendly File System) implementation. The vulnerability was discovered when a system panic occurred in the f2fsinvalidateblocks() function due to corrupted block addresses in NAT (Node Address Table) entries. The issue was reported by syzbot and was patched in October 2024 (Kernel Patch).

The vulnerability occurs in the truncatenode() function within fs/f2fs/node.c. When processing a fuzzed image, the block address (blkaddr) in the NAT entry could be corrupted, leading to a system panic when used in f2fsinvalidate_blocks(). The issue has a CVSS v3.1 Base Score of 5.5 (MEDIUM) with vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).

When exploited, this vulnerability can cause a denial of service condition through a system panic. The issue affects Linux kernel versions up to (excluding) 6.6.64, versions from 6.7 up to (excluding) 6.11.11, and versions from 6.12 up to (excluding) 6.12.2 (NVD).

The issue has been fixed by adding a sanity check on the NAT block address in the truncatenode() function. The patch validates the block address before using it in f2fsinvalidate_blocks(). Users should update their Linux kernel to the latest version that includes the fix (Kernel Patch).