Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 09aeab68033161cb54f194da93e51a11aee6144b before 0f72fc9659d7f585460d43c158055df5afdcffb6; affected a4261bbc33fbf99b99c80aa3a2c5097611802980 before 793e1c7041b93af96ff87e678329bc16aee7ba88; affected 3aa660c059240e0c795217182cf7df32909dd917 before 6ecb252efa0b413ac3d9979fb4eec247f8fc1258; affected 3aa660c059240e0c795217182cf7df32909dd917 before 14062c74e5b25c27edcff7a2fe0dc701c930b372; affected 3aa660c059240e0c795217182cf7df32909dd917 before aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9; affected f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa; affected 6.6.84 before 6.6.148; affected 6.12.20 before 6.12.101; affected 6.13.8 before 6.14 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6
- https://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88
- https://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258
- https://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372
- https://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9
ADP enrichment
No English description supplied.
No references supplied.