CVE-2026-53148 thunderbolt: Clamp XDomain response data copy to allocation size
A malicious Thunderbolt peer can trigger a buffer overflow in the Linux kernel, potentially leading to code execution or privilege escalation.
- 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-2026-53148?
CVE-2026-53148 is a high-severity memory corruption 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: Clamp XDomain response data copy to allocation size
tb_xdp_properties_request() derives the per-packet copy length from the response header without checking that it fits in the previously allocated data buffer. A malicious peer can set its length field larger than the declared data_length, causing memcpy to write past the kcalloc allocation.
Clamp the per-packet copy length so that the cumulative offset never exceeds data_len.
Weakness: CWE-787
Which versions are affected by CVE-2026-53148?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53148?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-53148 being exploited?
There is no known exploitation of CVE-2026-53148 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90692, BELL-CVE-2026-53148, DEBIAN-CVE-2026-53148, GHSA-ggvw-pp2v-j3gm, ROOT-OS-DEBIAN-11-CVE-2026-53148, ROOT-OS-DEBIAN-12-CVE-2026-53148 and 3 more.