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redhatcveRedhat.comRH:CVE-2021-47224
HistoryMay 23, 2024 - 1:59 p.m.

CVE-2021-47224

2024-05-2313:59:48
redhat.com
access.redhat.com
2
cve-2021-47224
linux kernel
net
ll_temac
vulnerability
resolved
skb pointer
use-after-free
dma
mitigation

6.7 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.5%

In the Linux kernel, the following vulnerability has been resolved: net: ll_temac: Make sure to free skb when it is completely used With the skb pointer piggy-backed on the TX BD, we have a simple and efficient way to free the skb buffer when the frame has been transmitted. But in order to avoid freeing the skb while there are still fragments from the skb in use, we need to piggy-back on the TX BD of the skb, not the first. Without this, we are doing use-after-free on the DMA side, when the first BD of a multi TX BD packet is seen as completed in xmit_done, and the remaining BDs are still being processed.

6.7 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.5%