ksmbd: preserve VFS inherited POSIX ACL mask

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93786
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:11 UTC
Updated2026-10-03 11:17:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: preserve VFS inherited POSIX ACL mask The VFS initializes a child's POSIX ACL from the parent's default ACL and the requested creation mode. Do not mutate the parent ACL or overwrite the child's VFS-computed access and default ACLs afterwards. This preserves restrictive ACL_MASK entries and prevents SMB object creation from widening effective permissions.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.003410000 probability, percentile 0.253460000 (date 2026-10-05)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d 4a19bb1c45667f5a5f6eff9cf6648e0f692d046f git Not specified
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d 591acf171644de590cda245fd8595b473a1beb70 git Not specified
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d 0093909becbda22b62b39b654dbc607faed59cd0 git Not specified
CNA Linux Linux affected f44158485826c076335d6860d35872271a83791d e148e567a9252643baa125cb65d7ae9c2c6cf68a git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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