| 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-2021-47239: net: usb: fix possible use-after-free in smsc75xx_bind |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: usb: fix possible use-after-free in smsc75xx_bind |
| |
| The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind") |
| fails to clean up the work scheduled in smsc75xx_reset-> |
| smsc75xx_set_multicast, which leads to use-after-free if the work is |
| scheduled to start after the deallocation. In addition, this patch |
| also removes a dangling pointer - dev->data[0]. |
| |
| This patch calls cancel_work_sync to cancel the scheduled work and set |
| the dangling pointer to NULL. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47239 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.4.271 with commit 200dbfcad8011e50c3cec269ed7b980836eeb1fa and fixed in 4.4.274 with commit 7cc8b2e05fcea6edd022d26e82091d781af8fd9b |
| Issue introduced in 4.9.271 with commit 22c840596af0c09068b6cf948616e6496e59e07f and fixed in 4.9.274 with commit 64160d1741a3de5204d1a822e058e0b4cc526504 |
| Issue introduced in 4.14.235 with commit 9e6b8c1ff9d997e1fa16cbd2d60739adf6dc1bbc and fixed in 4.14.238 with commit c4e3be2e7742863e454ce31faf8fd0109c00050b |
| Issue introduced in 4.19.193 with commit 9e6a3eccb28779710cbbafc4f4258d92509c6d07 and fixed in 4.19.196 with commit 2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b |
| Issue introduced in 5.4.124 with commit b95fb96e6339e34694dd578fb6bde3575b01af17 and fixed in 5.4.128 with commit 4252bf6c2b245f47011098113d405ffad6ad5d5b |
| Issue introduced in 5.10.42 with commit 635ac38b36255d3cfb8312cf7c471334f4d537e0 and fixed in 5.10.46 with commit 570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb |
| Issue introduced in 5.12.9 with commit 70c886ac93f87ae7214a0c69151a28a8075dd95b and fixed in 5.12.13 with commit 14616c372a7be01a2fb8c56c9d8debd232b9e43d |
| |
| 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-2021-47239 |
| 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/net/usb/smsc75xx.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/7cc8b2e05fcea6edd022d26e82091d781af8fd9b |
| https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504 |
| https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b |
| https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b |
| https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b |
| https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb |
| https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d |
| https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d |
