CVE-2024-26869

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to truncate meta inode pages forcely

Below race case can cause data corruption:

Thread A GC thread

- gc_data_segment

- ra_data_block

- locked meta_inode page

- f2fs_inplace_write_data

- invalidate_mapping_pages

: fail to invalidate meta_inode page

due to lock failure or dirty|writeback

status

- f2fs_submit_page_bio

: write last dirty data to old blkaddr

- move_data_block

- load old data from meta_inode page

- f2fs_submit_page_write

: write old data to new blkaddr

Because invalidate_mapping_pages() will skip invalidating page which

has unclear status including locked, dirty, writeback and so on, so

we need to use truncate_inode_pages_range() instead of

invalidate_mapping_pages() to make sure meta_inode page will be dropped.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References