ovl: check access to copy_file_range source with src mounter creds

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68448
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 01:17:07 UTC
Updated2026-08-12 01:17:07 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5dae222a5ff0c269730393018a5539cc970a4726 9ec22c8113d8cf72ed7197bb61037dcad09e50d8 git Not specified
CNA Linux Linux affected 5dae222a5ff0c269730393018a5539cc970a4726 1f4a107439d2e43db176e34919933e617cb7f2c5 git Not specified
CNA Linux Linux affected 5dae222a5ff0c269730393018a5539cc970a4726 a1e0eb8f55cfe09bb31a202a388babc411292656 git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1f4a107439d2e43db176e34919933e617cb7f2c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1e0eb8f55cfe09bb31a202a388babc411292656 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9ec22c8113d8cf72ed7197bb61037dcad09e50d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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