ksmbd: fix durable reconnect error path file lifetime

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64016
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:41 UTC
Updated2026-07-20 15:17:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: fix durable reconnect error path file lifetime After a durable reconnect succeeds, ksmbd_reopen_durable_fd() republishes the same ksmbd_file into the session volatile-id table. If smb2_open() then takes a later error path, cleanup first calls ksmbd_fd_put(work, fp) and then unconditionally calls ksmbd_put_durable_fd(dh_info.fp). In this case fp and dh_info.fp are the same object. The first put drops the reconnect lookup reference, but the final durable put can run __ksmbd_close_fd(NULL, fp). Because the final close is not session-aware, it can free the file object without removing the volatile-id entry that was just published into the session table. Use the session-aware put for the final reconnect drop when the reconnect had already succeeded and the error path is cleaning up the republished file. Earlier reconnect failures, before fp is assigned to dh_info.fp, keep using the durable-only put path.

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: 0.001660000 probability, percentile 0.061640000 (date 2026-07-20)

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 ce2e164c1c51c3f7813b80f8c926836e896bcbb3 a1a39f227c80cbf369767badc32cba2b225147d1 git Not specified
CNA Linux Linux affected 97a0cd55283b4e63fd92804da91c8d9896adcad9 6cb0b9385320110fe24a5d5ac0000ade4bb3a3f3 git Not specified
CNA Linux Linux affected 1baff47b81f94f9231c91236aa511420d0e266b9 3515503322f4819277091839eed46b695096aca5 git Not specified
CNA Linux Linux affected 6.18.33 6.18.34 semver Not specified
CNA Linux Linux affected 7.0.10 7.0.11 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3515503322f4819277091839eed46b695096aca5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1a39f227c80cbf369767badc32cba2b225147d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6cb0b9385320110fe24a5d5ac0000ade4bb3a3f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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