EUVD-2026-39239
GHSA-ggvw-pp2v-j3gm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Trigger is a malicious Thunderbolt/USB4 peer device physically connected to the host (AV:P), needing no host privileges (PR:N); kernel heap overwrite yields full C/I/A impact.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
9DescriptionNVD
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.
AnalysisAI
Heap out-of-bounds write in the Linux kernel Thunderbolt/USB4 XDomain driver lets a malicious connected peer device corrupt kernel memory. In tb_xdp_properties_request(), the per-packet copy length is taken from the attacker-controlled response header without validating it against the previously kcalloc-allocated data buffer, so a peer advertising a length larger than data_length forces memcpy to write past the allocation. …
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24 hours: Audit inventory for Thunderbolt/USB4-capable systems and identify users with exposure to physical connection threats. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
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