ksmbd: fix use-after-free in __close_file_table_ids()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74522
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:57 UTC
Updated2026-08-17 06:19:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in __close_file_table_ids() A ksmbd_file can remain alive after logical close while another session holds a temporary reference obtained through ksmbd_lookup_fd_inode(). ksmbd_close_fd() currently marks the file closed and drops the idr-owned reference, but leaves the pointer published in the closing session's idr until the final reference is dropped. If the foreign holder performs the final ksmbd_fd_put(), __put_fd_final() supplies the foreign session's file table to __ksmbd_close_fd(). The object is then freed without being removed from its owner's idr, and the owner session later dereferences the stale pointer during file-table teardown. Remove the volatile id from the owner's idr while ksmbd_close_fd() still holds that table's lock, and clear volatile_id before dropping the idr-owned reference. A later foreign final put then only performs physical destruction and cannot remove the object from the wrong table.

Risk And Classification

Primary CVSS: v3.1 8.8 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:H

EPSS: 0.001680000 probability, percentile 0.064850000 (date 2026-08-16)

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8510a043d334ecdf83d4604782f288db6bf21d60 67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd git Not specified
CNA Linux Linux affected 8510a043d334ecdf83d4604782f288db6bf21d60 0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac git Not specified
CNA Linux Linux affected 8510a043d334ecdf83d4604782f288db6bf21d60 9be4a66f019ea90bd9deca70511f4f9ffebf5c6f git Not specified
CNA Linux Linux affected 8510a043d334ecdf83d4604782f288db6bf21d60 cffbdc86393b0235383a20c8c59bc32f16036459 git Not specified
CNA Linux Linux affected 8510a043d334ecdf83d4604782f288db6bf21d60 e7188199eff46a636f3436356f0aae039be6dd66 git Not specified
CNA Linux Linux affected df30cbfd3d8a70e61ce59f63ce5ed2261799ac10 git Not specified
CNA Linux Linux affected aaf1d5ebb358f546414965b39da90107a7ca7ce5 git Not specified
CNA Linux Linux affected 5.15.38 5.16 semver Not specified
CNA Linux Linux affected 5.17.6 5.18 semver Not specified
CNA Linux Linux affected 5.18 Not specified
CNA Linux Linux unaffected 5.18 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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