CVE-2026-53146 thunderbolt: Limit XDomain response copy to actual frame size
A local attacker can read stale memory contents from previous Thunderbolt transactions due to improper bounds checking in the kernel driver.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53146?
CVE-2026-53146 is a high-severity vulnerability in Linux kernel, published on 25 Jun 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:
thunderbolt: Limit XDomain response copy to actual frame size
tb_xdomain_copy() copies req->response_size bytes from the received packet buffer regardless of the actual frame size. When a short response arrives, this reads past the valid frame data in the DMA pool buffer into stale contents from previous transactions.
Use the minimum of frame size and expected response size for the copy length.
Weakness: CWE-125
Which versions are affected by CVE-2026-53146?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53146?
Apply the vendor's patch.
Is CVE-2026-53146 being exploited?
There is no known exploitation of CVE-2026-53146 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90590, BELL-CVE-2026-53146, DEBIAN-CVE-2026-53146, GHSA-9cph-qj5m-89rx, ROOT-OS-DEBIAN-11-CVE-2026-53146, ROOT-OS-DEBIAN-12-CVE-2026-53146 and 3 more.