| 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-2022-49295: nbd: call genl_unregister_family() first in nbd_cleanup() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nbd: call genl_unregister_family() first in nbd_cleanup() |
| |
| Otherwise there may be race between module removal and the handling of |
| netlink command, which can lead to the oops as shown below: |
| |
| BUG: kernel NULL pointer dereference, address: 0000000000000098 |
| Oops: 0002 [#1] SMP PTI |
| CPU: 1 PID: 31299 Comm: nbd-client Tainted: G E 5.14.0-rc4 |
| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) |
| RIP: 0010:down_write+0x1a/0x50 |
| Call Trace: |
| start_creating+0x89/0x130 |
| debugfs_create_dir+0x1b/0x130 |
| nbd_start_device+0x13d/0x390 [nbd] |
| nbd_genl_connect+0x42f/0x748 [nbd] |
| genl_family_rcv_msg_doit.isra.0+0xec/0x150 |
| genl_rcv_msg+0xe5/0x1e0 |
| netlink_rcv_skb+0x55/0x100 |
| genl_rcv+0x29/0x40 |
| netlink_unicast+0x1a8/0x250 |
| netlink_sendmsg+0x21b/0x430 |
| ____sys_sendmsg+0x2a4/0x2d0 |
| ___sys_sendmsg+0x81/0xc0 |
| __sys_sendmsg+0x62/0xb0 |
| __x64_sys_sendmsg+0x1f/0x30 |
| do_syscall_64+0x3b/0xc0 |
| entry_SYSCALL_64_after_hwframe+0x44/0xae |
| Modules linked in: nbd(E-) |
| |
| The Linux kernel CVE team has assigned CVE-2022-49295 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.14.283 with commit 8a1435c862ea09b06be7acda325128dc08458e25 |
| Fixed in 4.19.247 with commit 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c |
| Fixed in 5.4.198 with commit 1be608e1ee1f222464b2856bda9b85ab5184a33e |
| Fixed in 5.10.122 with commit c0868f6e728c3c28bef0e8bee89d2daf86a8bbca |
| Fixed in 5.15.47 with commit cbeafa7a79d08ecdb55f8f1d41a11323d0f709db |
| Fixed in 5.17.15 with commit 6f505bbb8063fd3a238a4239d2d8c165e5279f6f |
| Fixed in 5.18.4 with commit 3d5da1ffba3388c2ae2e6c598855a4d887d3bf79 |
| Fixed in 5.19 with commit 06c4da89c24e7023ea448cadf8e9daf06a0aae6e |
| |
| 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-2022-49295 |
| 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: |
| drivers/block/nbd.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/8a1435c862ea09b06be7acda325128dc08458e25 |
| https://git.kernel.org/stable/c/013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c |
| https://git.kernel.org/stable/c/1be608e1ee1f222464b2856bda9b85ab5184a33e |
| https://git.kernel.org/stable/c/c0868f6e728c3c28bef0e8bee89d2daf86a8bbca |
| https://git.kernel.org/stable/c/cbeafa7a79d08ecdb55f8f1d41a11323d0f709db |
| https://git.kernel.org/stable/c/6f505bbb8063fd3a238a4239d2d8c165e5279f6f |
| https://git.kernel.org/stable/c/3d5da1ffba3388c2ae2e6c598855a4d887d3bf79 |
| https://git.kernel.org/stable/c/06c4da89c24e7023ea448cadf8e9daf06a0aae6e |
