| 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-2021-47480: scsi: core: Put LLD module refcnt after SCSI device is released |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: core: Put LLD module refcnt after SCSI device is released |
| |
| SCSI host release is triggered when SCSI device is freed. We have to make |
| sure that the low-level device driver module won't be unloaded before SCSI |
| host instance is released because shost->hostt is required in the release |
| handler. |
| |
| Make sure to put LLD module refcnt after SCSI device is released. |
| |
| Fixes a kernel panic of 'BUG: unable to handle page fault for address' |
| reported by Changhui and Yi. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47480 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.4.292 with commit 1105573d964f7b78734348466b01f5f6ba8a1813 |
| Fixed in 4.9.290 with commit 8e4814a461787e15a31d322d9efbe0d4f6822428 |
| Fixed in 4.14.255 with commit 61a0faa89f21861d1f8d059123b5c285a5d9ffee |
| Fixed in 4.19.216 with commit c2df161f69fb1c67f63adbd193368b47f511edc0 |
| Fixed in 5.4.158 with commit 1ce287eff9f23181d5644db787f472463a61f68b |
| Fixed in 5.10.78 with commit 7b57c38d12aed1b5d92f74748bed25e0d041729f |
| Fixed in 5.14.17 with commit f30822c0b4c35ec86187ab055263943dc71a6836 |
| Fixed in 5.15 with commit f2b85040acec9a928b4eb1b57a989324e8e38d3f |
| |
| 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-2021-47480 |
| 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/scsi/scsi.c |
| drivers/scsi/scsi_sysfs.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/1105573d964f7b78734348466b01f5f6ba8a1813 |
| https://git.kernel.org/stable/c/8e4814a461787e15a31d322d9efbe0d4f6822428 |
| https://git.kernel.org/stable/c/61a0faa89f21861d1f8d059123b5c285a5d9ffee |
| https://git.kernel.org/stable/c/c2df161f69fb1c67f63adbd193368b47f511edc0 |
| https://git.kernel.org/stable/c/1ce287eff9f23181d5644db787f472463a61f68b |
| https://git.kernel.org/stable/c/7b57c38d12aed1b5d92f74748bed25e0d041729f |
| https://git.kernel.org/stable/c/f30822c0b4c35ec86187ab055263943dc71a6836 |
| https://git.kernel.org/stable/c/f2b85040acec9a928b4eb1b57a989324e8e38d3f |
