CVE-2026-53148

Analyzed Analyzed - Analysis Complete

Thunderbolt XDomain Response Data Copy Length Bypass

Publication date: 2026-06-25

Last updated on: 2026-07-15

Assigner: kernel.org

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.

CVSS Scores

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Meta Information

Published

2026-06-25

Last Modified

2026-07-15

Generated

2026-07-15

AI Q&A

2026-06-25

EPSS Evaluated

2026-07-14

NVD

CVE-2026-53148

EUVD

EUVD-2026-39239

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	From 5.16 (inc) to 6.1.176 (exc)
linux	linux_kernel	From 6.2 (inc) to 6.6.143 (exc)
linux	linux_kernel	From 5.11 (inc) to 5.15.210 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.36 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.94 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.13 (exc)
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	From 4.15 (inc) to 5.10.259 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's Thunderbolt subsystem. Specifically, the function tb_xdp_properties_request() copies data based on a length value derived from a response header without verifying that this length fits within the allocated buffer size. A malicious peer can exploit this by setting the length field larger than the actual allocated data length, causing the memcpy operation to write beyond the allocated memory buffer.

The fix involves clamping the per-packet copy length so that the cumulative offset never exceeds the allocated data length, preventing out-of-bounds memory writes.

Impact Analysis

This vulnerability can lead to out-of-bounds memory writes in the Linux kernel when handling Thunderbolt device communications. Such memory corruption can potentially cause system instability, crashes, or be leveraged by an attacker to execute arbitrary code with kernel privileges.

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