CVE-2026-68448

In the Linux kernel, the following vulnerability has been resolved:

ovl: check access to copy_file_range source with src mounter creds

Commit 5dae222a5ff0c ("vfs: allow copy_file_range to copy across devices")

allowed filesystems that implement the copy_file_range() f_op to decide

if they want to access cross-sb copy from/to the same fs type.

The same commit added checks to verify same sb copy for filesystems that

implement ->copy_file_range() and do not support cross-sb copy at the

time, namely, to ceph, fuse and nfs.

The two remaining fs which implement ->copy_file_range(), cifs and

overlayfs started to support cross-sb copy from this time.

While overlayfs does support cross-sb copy when the two underlying files

are on the same base fs, the copy operation on the two real files from

two different overalyfs filesystems is performed with the mounter

creds of the destination overlayfs and the read permission access hook

for the source file was called with the wrong creds.

This could cause either deny of access to copy which would otherwise be

allowed (e.g. with splice) or allow read access to file which would

otherwise be denied.

Fix the latter case by explicitly verifying read access to source file

with the source overlayfs mounter creds.

The former case remains a quirk of cross-sb overlayfs copy, but

userspace could fall back to regular copy so no harm done.