Listen to this Post
How the mentioned CVE works:
The vulnerability is not a security flaw but a kernel runtime warning triggered during inode eviction in the Fuse filesystem. A WARN_ON_ONCE check in the `truncate_folio_batch_exceptionals()` function is designed to ensure all Direct Access (DAX) entries are properly removed from a folio before truncation. The Fuse filesystem lacked the necessary cleanup logic for its DAX entries prior to this fix. When an inode is being evicted from memory, the truncation process encounters these unexpected DAX entries, triggering the warning and printing a full kernel stack trace to the system logs. This does not lead to privilege escalation or data corruption but indicates a filesystem inconsistency that is now resolved.
Platform: Linux Kernel
Version: Up to 6.16.0-rc2
Vulnerability : Runtime Warning
Severity: Low
date: 2025-07-25
Prediction: Patch expected 2025-07-26
What Undercode Say:
`grep -r “truncate_folio_batch_exceptionals” /usr/src/linux-kernel/`
`dmesg | grep “WARNING:”`
`cat /proc/version`
Code snippet from the patch:
`if (dax_page) {`
` clear_exceptional_entry(&folio->page_cache, dax_page);`
`}`
How Exploit:
Not exploitable
Kernel log spam
System instability potential
Protection from this CVE
Update Kernel
Apply patch
Disable Fuse DAX
Impact:
System log pollution
Potential performance degradation
No security compromise
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
