GFS2 Inode Address Space Management Vulnerability in Linux Kernel

CVE-2025-21699

Summary

A vulnerability exists in the Linux kernel related to the GFS2 file system's handling of inode address space when the GFS2_DIF_JDATA flag is toggled. This issue arises from the improper management of inode states, where the kernel may erroneously mix buffer heads with iomap_folio_state structures. Such a flaw could lead to inconsistencies in the inode's address space management, potentially causing data corruption or system instability.

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