ksmbd: pin conn during async oplock break notification

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68381
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:31 UTC
Updated2026-08-13 23:17:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: pin conn during async oplock break notification smb2_oplock_break_noti() and smb2_lease_break_noti() store a ksmbd_conn pointer in an async ksmbd_work and then queue that work on ksmbd-io. The work only increments conn->r_count, which prevents teardown from passing the pending-request wait after the increment, but it does not pin the struct ksmbd_conn object. If connection teardown races with an oplock break notification, the last conn reference can be dropped before the queued worker finishes. The worker then uses the freed conn in ksmbd_conn_write() and ksmbd_conn_r_count_dec(). Take a real conn reference when publishing the conn pointer to the async work item, and drop it after the notification work has decremented r_count. Apply the same lifetime rule to lease break notification, which uses the same work->conn pattern.

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: 0.001680000 probability, percentile 0.064190000 (date 2026-08-13)

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 09aeab68033161cb54f194da93e51a11aee6144b 0f72fc9659d7f585460d43c158055df5afdcffb6 git Not specified
CNA Linux Linux affected a4261bbc33fbf99b99c80aa3a2c5097611802980 793e1c7041b93af96ff87e678329bc16aee7ba88 git Not specified
CNA Linux Linux affected 3aa660c059240e0c795217182cf7df32909dd917 6ecb252efa0b413ac3d9979fb4eec247f8fc1258 git Not specified
CNA Linux Linux affected 3aa660c059240e0c795217182cf7df32909dd917 14062c74e5b25c27edcff7a2fe0dc701c930b372 git Not specified
CNA Linux Linux affected 3aa660c059240e0c795217182cf7df32909dd917 aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9 git Not specified
CNA Linux Linux affected f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa git Not specified
CNA Linux Linux affected 6.6.84 6.6.148 semver Not specified
CNA Linux Linux affected 6.12.20 6.12.101 semver Not specified
CNA Linux Linux affected 6.13.8 6.14 semver Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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