CVE-2026-64056 net: ethernet: cortina: Make RX SKB per-port
A race condition in the Cortina Ethernet driver allows concurrent access to shared RX SKB structures, potentially causing system instability or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64056?
CVE-2026-64056 is a critical vulnerability in Linux kernel, published on 19 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: cortina: Make RX SKB per-port
The SKB used to assemble packets from fragments in gmac_rx() is static local, but the Gemini has two ethernet ports, meaning there can be races between the ports on a bad day if a device is using both.
Make the RX SKB a per-port variable and carry it over between invocations in the port struct instead.
Zero the pointer once we call napi_gro_frags(), on error (after calling napi_free_frags()) or if the port is stopped.
Zero it in some place where not strictly necessary just to emphasize what is going on.
This was found by Sashiko during normal patch review.
Which versions are affected by CVE-2026-64056?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64056?
Apply the vendor's patch.
Is CVE-2026-64056 being exploited?
There is no known exploitation of CVE-2026-64056 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64056, DEBIAN-CVE-2026-64056, GHSA-h3jw-23r7-cv6p, UBUNTU-CVE-2026-64056.