Linux Kernel Vulnerability in EROFS for File-Backed Mounts

CVE-2024-56750

Summary

A vulnerability exists in the Linux kernel's EROFS filesystem that impacts file-backed mounts when the filesystem's block size is set smaller than the PAGE_SIZE. The issue arises from the improper adjustment of the sb->s_blocksize and sb->s_blocksize_bits parameters. This oversight leads to system instability and potential crashes, as the previous method of using sb_set_blocksize() was unsuitable for scenarios where block devices were not employed. It is critical for users operating with affected versions of the Linux kernel to ensure timely updates to mitigate this risk.

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