| From bippy-7c5fe7eed585 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-2021-47361: mcb: fix error handling in mcb_alloc_bus() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mcb: fix error handling in mcb_alloc_bus() |
| |
| There are two bugs: |
| 1) If ida_simple_get() fails then this code calls put_device(carrier) |
| but we haven't yet called get_device(carrier) and probably that |
| leads to a use after free. |
| 2) After device_initialize() then we need to use put_device() to |
| release the bus. This will free the internal resources tied to the |
| device and call mcb_free_bus() which will free the rest. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47361 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.7 with commit 18d28819809909c3f24bb72183a901c5e332a63d and fixed in 4.9.285 with commit 8a558261fa57a6deefb0925ab1829f698b194aea |
| Issue introduced in 4.7 with commit 18d28819809909c3f24bb72183a901c5e332a63d and fixed in 4.14.249 with commit 115b07d9f47e3996430b8f2007edd9768e1f807f |
| Issue introduced in 4.7 with commit 18d28819809909c3f24bb72183a901c5e332a63d and fixed in 4.19.209 with commit 66f74ba9be9daf9c47fface6af3677f602774f6b |
| Issue introduced in 4.7 with commit 18d28819809909c3f24bb72183a901c5e332a63d and fixed in 5.4.150 with commit 7751f609eadf36b1f53712bae430019c53a16eb0 |
| Issue introduced in 4.7 with commit 18d28819809909c3f24bb72183a901c5e332a63d and fixed in 5.10.70 with commit 91e4ad05bf18322b5921d1a6c9b603f6eb1694f0 |
| Issue introduced in 4.7 with commit 18d28819809909c3f24bb72183a901c5e332a63d and fixed in 5.14.9 with commit 9fc198f415dee070a1de957bb5bf5921d8df3499 |
| Issue introduced in 4.7 with commit 18d28819809909c3f24bb72183a901c5e332a63d and fixed in 5.15 with commit 25a1433216489de4abc889910f744e952cb6dbae |
| |
| 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-2021-47361 |
| 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/mcb/mcb-core.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/8a558261fa57a6deefb0925ab1829f698b194aea |
| https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f |
| https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b |
| https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0 |
| https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0 |
| https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499 |
| https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbae |
