CVE-2026-98687
Received
Received - Intake
Heap Out-of-Bounds Read in Linux Kernel Thunderbolt
Vulnerability report for CVE-2026-98687, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
thunderbolt: Reject oversized XDomain properties responses
tb_xdp_properties_request() allocates room for 45 data dwords in its
252-byte response buffer. The XDomain length field is six bits wide,
however, and a malicious peer can set it to 63. After the fixed response
fields are subtracted, the driver treats this as 48 data dwords.
Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to
allocation size") only bounds the copy against data_len. If data_len is
at least 48, memcpy() reads 192 bytes from the 180-byte res->data array,
causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478
("thunderbolt: Limit XDomain response copy to actual frame size") limits
the earlier copy but does not constrain this header-derived length.
Reject response data lengths that exceed the allocated source buffer
before copying them into the assembled property block.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | d1ff70241a275133e1a0258b7c23588b122276c8 |
| Linux | Linux | d1ff70241a275133e1a0258b7c23588b122276c8 |
| Linux | Linux | d1ff70241a275133e1a0258b7c23588b122276c8 |
| Linux | Linux | d1ff70241a275133e1a0258b7c23588b122276c8 |
| Linux | Linux | 4.15 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
