CVE-2026-53149 thunderbolt: Bound root directory content to block size
A missing bounds check in the Linux kernel Thunderbolt driver allows out-of-bounds reads, potentially leading to denial of service or code execution.
- 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-2026-53149?
CVE-2026-53149 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: Bound root directory content to block size
__tb_property_parse_dir() does not check that content_offset + content_len fits within block_len for the root directory case. When rootdir->length equals or exceeds block_len - 2, the entry loop reads past the allocated property block.
Add a bounds check after computing content_offset and content_len to reject directories whose content extends past the block.
Weakness: CWE-125
Which versions are affected by CVE-2026-53149?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53149?
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-2026-53149 being exploited?
There is no known exploitation of CVE-2026-53149 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90285, BELL-CVE-2026-53149, DEBIAN-CVE-2026-53149, GHSA-4463-xxf2-768j, ROOT-OS-DEBIAN-11-CVE-2026-53149, ROOT-OS-DEBIAN-12-CVE-2026-53149 and 3 more.