Question: What is CVE-2025-21699?
Answer: CVE-2025-21699 is a vulnerability classified as medium with a CVSS score of 5.5. It falls under NVD-CWE-noinfo and affects the system as follows: In the Linux kernel, the following vulnerability has been resolved:

gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag

Truncate an inode's address space when flipping the GFS2_DIF_JDATA flag:
depending on that flag, the pages in the address space will either use
buffer heads or iomap_folio_state structs, and we cannot mix the two.