CVE-2026-64216 is a vulnerability in Linux Kernel
Published on July 24, 2026
netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()
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.
Products Associated with CVE-2026-64216
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and below 6080fa3ecfbb4448a3b47368629534c09b6ec750 is affected.
- Version ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and below 3866d015f33aeedf81338dd99154703bef33faef is affected.
- Version ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and below dbe556972100fabb8e5a1b3d2163831ff07b1e8e is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.