CVE-2026-99277
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: hold a connection reference for each session channel ksmbd_session_unregister() removes a session from the global and per- connection tables before dropping the table reference. A concurrent reference holder can keep the session and its channel list alive after those removals. Connection cleanup can no longer find the unpublished session to remove its channels. Since a channel only stores a raw conn pointer, the connection can be freed while another session reference holder is still accessing it, for example during SMB3.1.1 binding or a procfs read. Take a connection reference when registering a channel and release it on insertion failure, channel removal, or final session destruction. Keep the channels and signing keys until the session is destroyed so a response can still be signed after the session has been unregistered.
How to fix
- Linux Linux4b333aed69cfc2c8687b86b6a4364a0dffc16dd8, add8d7fb04efe564193df73581889c62fc0016f1, 7.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | d7fd1f98607f2cd358e583f9548bdf0173090a86 ≤ v < 4b333aed69cfc2c8687b86b6a4364a0dffc16dd8, d7fd1f98607f2cd358e583f9548bdf0173090a86 ≤ v < add8d7fb04efe564193df73581889c62fc0016f1, c99ea7855124ca1428a1e59c2b4590aaef34eacf, 7.2.8 ≤ v < 7.3, 7.3 | 4b333aed69cfc2c8687b86b6a4364a0dffc16dd8, add8d7fb04efe564193df73581889c62fc0016f1, 7.3 |
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