| 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-2022-49138: Bluetooth: hci_event: Ignore multiple conn complete events |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| Bluetooth: hci_event: Ignore multiple conn complete events |
| |
| When one of the three connection complete events is received multiple |
| times for the same handle, the device is registered multiple times which |
| leads to memory corruptions. Therefore, consequent events for a single |
| connection are ignored. |
| |
| The conn->state can hold different values, therefore HCI_CONN_HANDLE_UNSET |
| is introduced to identify new connections. To make sure the events do not |
| contain this or another invalid handle HCI_CONN_HANDLE_MAX and checks |
| are introduced. |
| |
| Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=215497 |
| |
| The Linux kernel CVE team has assigned CVE-2022-49138 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.17.3 with commit aa1ca580e3ffe62a2c5ea1c095b609b2943c5269 |
| Fixed in 5.18 with commit d5ebaa7c5f6f688959e8d40840b2249ede63b8ed |
| |
| 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-2022-49138 |
| 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: |
| include/net/bluetooth/hci_core.h |
| net/bluetooth/hci_conn.c |
| net/bluetooth/hci_event.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/aa1ca580e3ffe62a2c5ea1c095b609b2943c5269 |
| https://git.kernel.org/stable/c/d5ebaa7c5f6f688959e8d40840b2249ede63b8ed |
