CVE-2021-47224
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.23% probability · 14th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358Patch
- https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47Patch
- https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3Patch
- https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4bPatch
- https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358Patch
- https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47Patch
- https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3Patch
- https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.