CVE-2021-47239

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.

• linux linux kernel (>= 4.4.271 < 4.4.274) • linux linux kernel (>= 4.9.271 < 4.9.274) • linux linux kernel (>= 4.14.235 < 4.14.238) • linux linux kernel (>= 4.19.193 < 4.19.196) • linux linux kernel (>= 5.4.124 < 5.4.128) • linux linux kernel (>= 5.10.42 < 5.10.46) • linux linux kernel (>= 5.12.9 < 5.12.13)