CVE-2026-98175
Description
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.
How to fix
- Linux Linux180380272f116dbd2b0354c5c7872e112e519149, e3f6a779433d13aafb5edab59e4f9313051e8a52, 7ab9ceedd860216fb97f2d8574cbe58b8906f42a, 2e5103e11a17c274715dd56cf185eeedccf686b8, c65eae6f61d1778ff7a82e4aae4080e26f486af1, 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.9, 4.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 53e0e11efe9289535b060a51d4cf37c25e0d0f2b ≤ v < 180380272f116dbd2b0354c5c7872e112e519149, 53e0e11efe9289535b060a51d4cf37c25e0d0f2b ≤ v < e3f6a779433d13aafb5edab59e4f9313051e8a52, 53e0e11efe9289535b060a51d4cf37c25e0d0f2b ≤ v < 7ab9ceedd860216fb97f2d8574cbe58b8906f42a, 53e0e11efe9289535b060a51d4cf37c25e0d0f2b ≤ v < 2e5103e11a17c274715dd56cf185eeedccf686b8, 53e0e11efe9289535b060a51d4cf37c25e0d0f2b ≤ v < c65eae6f61d1778ff7a82e4aae4080e26f486af1, e008a962311a875a828cbae54b43285858aaa6c8, 123b228a09b90b50b0a9d6eb8294cf0c42efc029, 0ba4c6eaaacbcc4b18f51bb3b1567c65a8fecca9, d0d2a4c82942e2f51e4984beea1f7e5a994bd06c, 15a12fbbf365a483b1c19f9caeb707b3bea77e10, f0b715409cb9cf7e21e690f9b163047739761962, ff04da387c10b6bf7b510392742c8cd46c130fd6, 48f9526f4dcb4b132fe0dc2450835311e3b013a6, 3.10.107 ≤ v < 3.11, 3.12.70 ≤ v < 3.13, 3.16.42 ≤ v < 3.17, 3.18.47 ≤ v < 3.19, 4.1.38 ≤ v < 4.2, 4.4.40 ≤ v < 4.5, 4.8.16 ≤ v < 4.9, 4.9.1 ≤ v < 4.10, 4.10 | 180380272f116dbd2b0354c5c7872e112e519149, e3f6a779433d13aafb5edab59e4f9313051e8a52, 7ab9ceedd860216fb97f2d8574cbe58b8906f42a, 2e5103e11a17c274715dd56cf185eeedccf686b8, c65eae6f61d1778ff7a82e4aae4080e26f486af1, 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.9, 4.10 |
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