| 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-2025-22040: ksmbd: fix session use-after-free in multichannel connection |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: fix session use-after-free in multichannel connection |
| |
| There is a race condition between session setup and |
| ksmbd_sessions_deregister. The session can be freed before the connection |
| is added to channel list of session. |
| This patch check reference count of session before freeing it. |
| |
| The Linux kernel CVE team has assigned CVE-2025-22040 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.1.134 with commit 596407adb9af1ee75fe7c7529607783d31b66e7f |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.6.87 with commit 3980770cb1470054e6400fd97668665975726737 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.12.23 with commit 9069939d762138e232a6f79e3e1462682ed6a17d |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.13.11 with commit 94c281721d4ed2d972232414b91d98a6f5bdb16b |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.14.2 with commit 7dfbd4c43eed91dd2548a95236908025707a8dfd |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.15 with commit fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db |
| |
| 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-2025-22040 |
| 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/auth.c |
| fs/smb/server/mgmt/user_session.c |
| fs/smb/server/smb2pdu.c |
| |
| |
| 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/596407adb9af1ee75fe7c7529607783d31b66e7f |
| https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737 |
| https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d |
| https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b |
| https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd |
| https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db |
