Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: smb: client: cancel reconnect work in clean_demultiplex_info() clean_demultiplex_info() cancels server->echo delayed work but not server->reconnect, which can cause a use-after-free when the demultiplex thread exits while a reconnect work is still queued: cifs_demultiplex_thread() cifs_readv_from_socket() cifs_reconnect() __cifs_reconnect() cifs_queue_server_reconn() mod_delayed_work(cifsiod_wq, &server->reconnect, 0) clean_demultiplex_info() cancel_delayed_work_sync(&server->echo) // echo canceled // reconnect NOT canceled kfree_sensitive(server) // server freed ...later, on cifsiod_wq: smb2_reconnect_server() server->srv_count // UAF read of freed server Fix this by canceling server->reconnect delayed work in clean_demultiplex_info() before the server is freed, the same way cifs_put_tcp_session() already does.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 53e0e11efe9289535b060a51d4cf37c25e0d0f2b before 180380272f116dbd2b0354c5c7872e112e519149; affected 53e0e11efe9289535b060a51d4cf37c25e0d0f2b before e3f6a779433d13aafb5edab59e4f9313051e8a52; affected 53e0e11efe9289535b060a51d4cf37c25e0d0f2b before 7ab9ceedd860216fb97f2d8574cbe58b8906f42a; affected 53e0e11efe9289535b060a51d4cf37c25e0d0f2b before 2e5103e11a17c274715dd56cf185eeedccf686b8; affected 53e0e11efe9289535b060a51d4cf37c25e0d0f2b before c65eae6f61d1778ff7a82e4aae4080e26f486af1; affected e008a962311a875a828cbae54b43285858aaa6c8; affected 123b228a09b90b50b0a9d6eb8294cf0c42efc029; affected 0ba4c6eaaacbcc4b18f51bb3b1567c65a8fecca9; affected d0d2a4c82942e2f51e4984beea1f7e5a994bd06c; affected 15a12fbbf365a483b1c19f9caeb707b3bea77e10; affected f0b715409cb9cf7e21e690f9b163047739761962; affected ff04da387c10b6bf7b510392742c8cd46c130fd6; affected 48f9526f4dcb4b132fe0dc2450835311e3b013a6; affected 3.10.107 before 3.11; affected 3.12.70 before 3.13; affected 3.16.42 before 3.17; affected 3.18.47 before 3.19; affected 4.1.38 before 4.2; affected 4.4.40 before 4.5; affected 4.8.16 before 4.9; affected 4.9.1 before 4.10 |
| Linux / Linux | affected 4.10; unaffected 0 before 4.10; unaffected 6.6.158 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.54 through 6.18.*; unaffected 7.2.8 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149
- https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52
- https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a
- https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8
- https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1