| 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-2023-52837: nbd: fix uaf in nbd_open |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nbd: fix uaf in nbd_open |
| |
| Commit 4af5f2e03013 ("nbd: use blk_mq_alloc_disk and |
| blk_cleanup_disk") cleans up disk by blk_cleanup_disk() and it won't set |
| disk->private_data as NULL as before. UAF may be triggered in nbd_open() |
| if someone tries to open nbd device right after nbd_put() since nbd has |
| been free in nbd_dev_remove(). |
| |
| Fix this by implementing ->free_disk and free private data in it. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52837 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.14 with commit 4af5f2e0301311f88c420fcfc5f3c8611ade20ac and fixed in 6.1.63 with commit 4e9b3ec84dc97909876641dad14e0a2300d6c2a3 |
| Issue introduced in 5.14 with commit 4af5f2e0301311f88c420fcfc5f3c8611ade20ac and fixed in 6.5.12 with commit 879947f4180bc6e83af64eb0515e0cf57fce15db |
| Issue introduced in 5.14 with commit 4af5f2e0301311f88c420fcfc5f3c8611ade20ac and fixed in 6.6.2 with commit 56bd7901b5e9dbc9112036ea615ebcba1565fafe |
| Issue introduced in 5.14 with commit 4af5f2e0301311f88c420fcfc5f3c8611ade20ac and fixed in 6.7 with commit 327462725b0f759f093788dfbcb2f1fd132f956b |
| |
| 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-2023-52837 |
| 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/4e9b3ec84dc97909876641dad14e0a2300d6c2a3 |
| https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db |
| https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe |
| https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b |
