| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2023-52480: ksmbd: fix race condition between session lookup and expire |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: fix race condition between session lookup and expire |
| |
| Thread A + Thread B |
| ksmbd_session_lookup | smb2_sess_setup |
| sess = xa_load | |
| | |
| | xa_erase(&conn->sessions, sess->id); |
| | |
| | ksmbd_session_destroy(sess) --> kfree(sess) |
| | |
| // UAF! | |
| sess->last_active = jiffies | |
| + |
| |
| This patch add rwsem to fix race condition between ksmbd_session_lookup |
| and ksmbd_expire_session. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52480 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 5.15.145 with commit c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.1.57 with commit a2ca5fd3dbcc665e1169044fa0c9e3eba779202b |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.5.7 with commit 18ced78b0ebccc2d16f426143dc56ab3aad666be |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.6 with commit 53ff5cf89142b978b1a5ca8dc4d4425e6a09745f |
| |
| 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-2023-52480 |
| 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/connection.h |
| fs/smb/server/mgmt/user_session.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/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f |
| https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b |
| https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be |
| https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f |
