Tracker / CVE-2021-47224
CVE-2021-47224
High 7.8
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 and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · … → 5.4.128 |
| linux | linux_kernel · 5.11 → 5.12.13 |
| linux | linux_kernel · 5.5 → 5.10.46 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.