CVE-2026-64216

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/6080fa3ecfbb4448a3b47368629534c09b6ec750
• https://git.kernel.org/stable/c/3866d015f33aeedf81338dd99154703bef33faef
• https://git.kernel.org/stable/c/dbe556972100fabb8e5a1b3d2163831ff07b1e8e

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