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redhatcveRedhat.comRH:CVE-2021-47239
HistoryMay 23, 2024 - 2:02 p.m.

CVE-2021-47239

2024-05-2314:02:18
redhat.com
access.redhat.com
2
linux kernel
vulnerability
cve-2021-47239
usb
use-after-free
memory leak
work scheduled
patch
cancel_work_sync
dangling pointer

6.4 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.0%

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.

6.4 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.0%