# CVE-2024-46794: x86/tdx: Fix data leak in mmio_read()

> A flaw in the Linux kernel's TDX module leaks stack data to the VMM during MMIO reads, allowing potential information disclosure.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Sep 2024
- **Updated:** 11 May 2026
- **Also known as:** AZL-53295, BELL-CVE-2024-46794, DEBIAN-CVE-2024-46794, GHSA-cx75-fvjc-vvr8, UBUNTU-CVE-2024-46794

## What is CVE-2024-46794?

CVE-2024-46794 is a low-severity vulnerability in Linux kernel, published on 18 Sep 2024. 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:

x86/tdx: Fix data leak in mmio_read()

The mmio_read() function makes a TDVMCALL to retrieve MMIO data for an
address from the VMM.

Sean noticed that mmio_read() unintentionally exposes the value of an
initialized variable (val) on the stack to the VMM.

This variable is only needed as an output value. It did not need to be
passed to the VMM in the first place.

Do not send the original value of *val to the VMM.

[ dhansen: clarify what 'val' is used for. ]

## Which versions are affected by CVE-2024-46794?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-46794?

Apply the vendor's patch.

## Is CVE-2024-46794 being exploited?

There is no known exploitation of CVE-2024-46794 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-2024-46794 and fix it if it is affected.

What it is: CVE-2024-46794 is a low-severity vulnerability in Linux kernel, published on 18 Sep 2024. 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-2024-46794 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-2024-46794/ (Markdown: https://insights.sbomify.com/CVE-2024-46794/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-46794
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-46794
- OSV: https://osv.dev/vulnerability/CVE-2024-46794

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-46794/
Summaries are generated and may contain mistakes; the official description above is the record.