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

> A local attacker can read stale memory contents from previous Thunderbolt transactions due to improper bounds checking in the kernel driver.

- **Severity:** High 7.1 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Jun 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-90590, BELL-CVE-2026-53146, DEBIAN-CVE-2026-53146, GHSA-9cph-qj5m-89rx, ROOT-OS-DEBIAN-11-CVE-2026-53146, ROOT-OS-DEBIAN-12-CVE-2026-53146, ROOT-OS-UBUNTU-2204-CVE-2026-53146, ROOT-OS-UBUNTU-2404-CVE-2026-53146, UBUNTU-CVE-2026-53146

## What is CVE-2026-53146?

CVE-2026-53146 is a high-severity vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-53146?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2026-53146?

Apply the vendor's patch.

## Is CVE-2026-53146 being exploited?

There is no known exploitation of CVE-2026-53146 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53146 and fix it if it is affected.

What it is: CVE-2026-53146 is a high-severity vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-53146 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-53146/ (Markdown: https://insights.sbomify.com/CVE-2026-53146/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53146
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53146
- OSV: https://osv.dev/vulnerability/CVE-2026-53146

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53146/
Summaries are generated and may contain mistakes; the official description above is the record.