CVE-2026-98172 PUBLISHED

smb: client: fix smbd_connection leak on cifs_get_tcp_session() error

Assigner: Linux
Reserved: 25.09.2026 Published: 06.10.2026 Updated: 06.10.2026

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix smbd_connection leak on cifs_get_tcp_session() error

When an RDMA connection is successfully established via smbd_get_connection() but cifs_get_tcp_session() later fails (e.g. kthread_create() returns an error), the error path frees tcp_ses without first destroying the smbd_connection.

Fix this by calling smbd_destroy() in the out_err cleanup path before kfree(tcp_ses). smbd_destroy() safely handles the case where smbd_conn is NULL, so it can be called unconditionally.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 2f8946464b11822169b9f10c7cf58a2440b51d54 to 3164402c58940ff58a3cecdb026405f07b0253af (excl.)
  • affected from 2f8946464b11822169b9f10c7cf58a2440b51d54 to e3344bb0ff5ec8a276f42239e140f5442841ef23 (excl.)
  • affected from 2f8946464b11822169b9f10c7cf58a2440b51d54 to 5c908e49d349266dff0c86dda6a05df0ff19b824 (excl.)
  • affected from 2f8946464b11822169b9f10c7cf58a2440b51d54 to 928edc4bd6a617caabeb575fc13c254d9df623c4 (excl.)
  • affected from 2f8946464b11822169b9f10c7cf58a2440b51d54 to b26a3fcf2f1c2cadba400290b639f01395db8fc8 (excl.)
  • affected from 2f8946464b11822169b9f10c7cf58a2440b51d54 to e75c96157d45e498970158c8f7373d90102e33b9 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 4.16 is affected
  • unaffected from 0 to 4.16 (excl.)
  • unaffected from 6.1.189 to 6.1.* (incl.)
  • unaffected from 6.6.158 to 6.6.* (incl.)
  • unaffected from 6.12.112 to 6.12.* (incl.)
  • unaffected from 6.18.54 to 6.18.* (incl.)
  • unaffected from 7.2.8 to 7.2.* (incl.)
  • unaffected from 7.3-rc4 to * (incl.)

References