CVE-2026-98452smb: client: clean up failed cached directory opens

Official description

In the Linux kernel, the following vulnerability has been resolved: smb: client: clean up failed cached directory opens open_cached_dir() sends CREATE and QUERY_INFO as a compound request. If the CREATE succeeds but a later command returns an error, the function must retain the CREATE FID so common cleanup can issue SMB2_close(). It also must not treat a response error as a valid CREATE. Validate the CREATE response before using its fields, record the FIDs, and mark the handle open before handling errors from later compound commands. Move the -EREMCHG reconnect handling before response validation so a missing response does not hide the reconnect request. Count the handle when it is marked open; confirmed close responses decrement the counter, while existing close retry behavior remains best effort on transport failures.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/48958ddda3d7eee3600261e2d90671f63e055dc4
• https://git.kernel.org/stable/c/abab661eed00fa102d3c35ddf1cce4f687e718c1
• https://git.kernel.org/stable/c/7c1509598a4fdfb54cb09ce33e4405bd6dbd8295
• https://git.kernel.org/stable/c/d2ff5fb93ea83034025850266b5eed391f96b825