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CVE-2024-26869

Disclosure Date: April 17, 2024 •
CVE-2024-26869
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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.

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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Utility Class
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Ports
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OS
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Vulnerable Versions
Linux c92f2927df86
Linux not down converted
Prerequisites
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Discovered By
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Metasploit Module
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Vendors

  • Linux

Products

  • Linux
Technical Analysis