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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-68381

ksmbd: pin conn during async oplock break notification

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 8e6508c7ecb1802909f294827eff38f301d0c937 to < dab1493bc9d97947f1219d6823c2e2a28636021baffected
  • 09aeab68033161cb54f194da93e51a11aee6144b to < 0f72fc9659d7f585460d43c158055df5afdcffb6affected
  • a4261bbc33fbf99b99c80aa3a2c5097611802980 to < 793e1c7041b93af96ff87e678329bc16aee7ba88affected
  • 3aa660c059240e0c795217182cf7df32909dd917 to < 6ecb252efa0b413ac3d9979fb4eec247f8fc1258affected
  • 3aa660c059240e0c795217182cf7df32909dd917 to < 14062c74e5b25c27edcff7a2fe0dc701c930b372affected
  • 3aa660c059240e0c795217182cf7df32909dd917 to < aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9affected
  • f17d1c63a76b0fe8e9c78023a86507a3a6d62cfaaffected
  • 6.6.84 to < 6.6.148affected
  • 6.12.20 to < 6.12.101affected
  • 6.13.8 to < 6.14affected

Linux Linux

Default version status: affected

  • 6.14affected
  • 0 to < 6.14unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References