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CVE-2026-63891

kernel: thunderbolt: property: Cap recursion depth in __tb_property_parse_dir()

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · July 21, 2026

Description

A flaw was found in the Linux kernel's Thunderbolt property parsing. An untrusted Thunderbolt peer, such as a cable or dock, can send specially crafted property requests that create a recursive loop. This can lead to kernel stack exhaustion, resulting in a system crash and a Denial of Service (DoS). This vulnerability can be triggered without authentication.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-606 · Unchecked Input for Loop Condition