ksmbd: require source read access for duplicate extents

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64395
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:22 UTC
Updated2026-07-27 05:16:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate extents FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB access mask granted to the source handle. A handle opened with attribute access can consequently be used to copy file contents into an attacker-readable destination. Require FILE_READ_DATA on the source handle before either VFS operation, matching other ksmbd data-copy paths.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.004060000 probability, percentile 0.332310000 (date 2026-07-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eb817368f50c1cbe1bd07044124aad7db6330e3a 2d2ab6983620c2d60ce7db72133984ca3873b929 git Not specified
CNA Linux Linux affected eb817368f50c1cbe1bd07044124aad7db6330e3a 67bdad9cf01b25030e3bf00bbce6c309319d6663 git Not specified
CNA Linux Linux affected eb817368f50c1cbe1bd07044124aad7db6330e3a b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f git Not specified
CNA Linux Linux affected eb817368f50c1cbe1bd07044124aad7db6330e3a db231af842868268839f9f9619c68cb27830d8be git Not specified
CNA Linux Linux affected eb817368f50c1cbe1bd07044124aad7db6330e3a a10942af27832c2761d020863a46e79bebe0567d git Not specified
CNA Linux Linux affected eb817368f50c1cbe1bd07044124aad7db6330e3a cedff600f1642aa982178503552f0d007bc829c8 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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