Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages() netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it is wanting to unlock and compares that to rreq->no_unlock_folio so that it doesn't unlock a folio being read for netfs_perform_write() or netfs_write_begin(). However, given that netfs_unlock_abandoned_read_pages() is called _after_ NETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to dereference is the one specified by ->no_unlock_folio as ownership immediately reverts to the caller. Fix this by storing the folio pointer instead and using that rather than the index. Also fix netfs_unlock_read_folio() where the same applies.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.12, < 6.18.34 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/3866d015f33aeedf81338dd99154703bef33faefPatch
- https://git.kernel.org/stable/c/6080fa3ecfbb4448a3b47368629534c09b6ec750Patch
- https://git.kernel.org/stable/c/dbe556972100fabb8e5a1b3d2163831ff07b1e8ePatch
FAQ
What is CVE-2026-64216?
CVE-2026-64216 is a vulnerability with a CVSS score of 9.8 (CRITICAL). In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages() netfs_unlock_abandoned_read_pages(rreq) accesses the index of the ...
How severe is CVE-2026-64216?
CVE-2026-64216 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-64216?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.