ksmbd: use opener credentials for ADS I/O

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64391
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:22 UTC
Updated2026-07-27 05:16:45 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for ADS I/O Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials. Run ADS I/O with the credentials captured when the SMB handle was opened.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.004570000 probability, percentile 0.372450000 (date 2026-07-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d a8f5d39971bbad9340d49cd41b0e2da9452a649d git Not specified
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d 2b4592cea214683de0f2ce6f8c22c097fb0ea1ab git Not specified
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d 52a56cf53ec834c44ac1b4d16d585f26613ee5ce git Not specified
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d baa5e094886fffa7e6272edcb5e08be5ce28262c git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 6.12.96 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/baa5e094886fffa7e6272edcb5e08be5ce28262c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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