CVE-2021-47239: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 4.4.271, before 4.4.274 (fixed in 4.4.274); from 4.9.271, before 4.9.274 (fixed in 4.9.274); from 4.14.235, before 4.14.238 (fixed in 4.14.238); from 4.19.193, before 4.19.196 (fixed in 4.19.196); from 5.4.124, before 5.4.128 (fixed in 5.4.128); from 5.10.42, before 5.10.46 (fixed in 5.10.46); …

Published 2024-05-21. Last modified 2026-06-17.