Bug 2492800 (CVE-2026-53146)

Summary: CVE-2026-53146 kernel: kernel: Information disclosure in Thunderbolt XDomain response handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Thunderbolt subsystem. A malicious or compromised Thunderbolt/USB4 peer can send a specially crafted, short response. This causes the `tb_xdomain_copy()` function to read beyond the valid data in the received frame, potentially exposing stale contents from previous transactions. This out-of-bounds read primarily leads to information disclosure, with potential limited impact on data integrity or system availability.
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Description OSIDB Bzimport 2026-06-25 10:06:26 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-06-29 13:07:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062545-CVE-2026-53146-1e8e@gregkh/T