CVE-2021-47224: 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: 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.

Affected products

• Linux Linux Kernel: before 5.4.128 (fixed in 5.4.128); from 5.5, before 5.10.46 (fixed in 5.10.46); from 5.11, before 5.12.13 (fixed in 5.12.13); version 5.13 only

Published 2024-05-21. Last modified 2026-08-04.