| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-37777: ksmbd: fix use-after-free in __smb2_lease_break_noti() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: fix use-after-free in __smb2_lease_break_noti() |
| |
| Move tcp_transport free to ksmbd_conn_free. If ksmbd connection is |
| referenced when ksmbd server thread terminates, It will not be freed, |
| but conn->tcp_transport is freed. __smb2_lease_break_noti can be performed |
| asynchronously when the connection is disconnected. __smb2_lease_break_noti |
| calls ksmbd_conn_write, which can cause use-after-free |
| when conn->ksmbd_transport is already freed. |
| |
| The Linux kernel CVE team has assigned CVE-2025-37777 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.12.26 with commit 1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.14.4 with commit e59796fc80603bcd8569d4d2e10b213c1918edb4 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.15 with commit 21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-37777 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| fs/smb/server/connection.c |
| fs/smb/server/transport_tcp.c |
| fs/smb/server/transport_tcp.h |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e |
| https://git.kernel.org/stable/c/e59796fc80603bcd8569d4d2e10b213c1918edb4 |
| https://git.kernel.org/stable/c/21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de |
