CVE-2026-74707 xsk: validate metadata when processing requests
A race condition in the Linux kernel XSK zero-copy path allows user space to bypass TX metadata validation by modifying data between checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74707?
CVE-2026-74707 is a high-severity vulnerability in Linux, published on 22 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
xsk: validate metadata when processing requests
The zero-copy path validates TX metadata while obtaining the descriptor context, then reads it again later when preparing the hardware request. User space can change the metadata between those operations and bypass the original validation.
Validate the metadata in xsk_tx_metadata_request() and use the resulting flags snapshot for every feature check. Read request fields once so all zero-copy drivers process only values observed after successful validation.
Which versions are affected by CVE-2026-74707?
How do I fix CVE-2026-74707?
Apply the vendor's patch.
Is CVE-2026-74707 being exploited?
There is no known exploitation of CVE-2026-74707 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74707, DEBIAN-CVE-2026-74707, GHSA-qvr7-gw3m-pmf7, UBUNTU-CVE-2026-74707.