# CVE-2026-74420: drm/gpusvm: Reject VMAs with VM_IO or VM_PFNMAP when creating SVM ranges

> A local attacker can cause a denial of service by triggering an infinite loop in the GPU SVM page-fault handler via invalid VMAs.

- **Severity:** Not scored
- **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:** 15 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** BELL-CVE-2026-74420, DEBIAN-CVE-2026-74420, GHSA-rwh9-4wc5-hmq7, UBUNTU-CVE-2026-74420

## What is CVE-2026-74420?

CVE-2026-74420 is a denial of service vulnerability in Linux, published on 15 Aug 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:

drm/gpusvm: Reject VMAs with VM_IO or VM_PFNMAP when creating SVM ranges

VMAs marked with VM_IO or VM_PFNMAP are not backed by struct page
objects, which GPUSVM requires in order to operate correctly. In
particular, get_pages() relies on hmm_range_fault() to resolve struct
pages for the target range.

Attempting to create an SVM range on such VMAs results in repeated
get_pages() failures and can lead to an infinite loop inside a driver’s
page‑fault handler. Prevent this by rejecting ranges on VM_IO or
VM_PFNMAP VMAs and returning -EIO.

## Which versions are affected by CVE-2026-74420?


## How do I fix CVE-2026-74420?

Apply the vendor's patch.

## Is CVE-2026-74420 being exploited?

There is no known exploitation of CVE-2026-74420 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-74420 and fix it if it is affected.

What it is: CVE-2026-74420 is a denial of service vulnerability in Linux, published on 15 Aug 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-2026-74420 in the wild and no public exploit code.

Affected product: Linux. 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-2026-74420/ (Markdown: https://insights.sbomify.com/CVE-2026-74420/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-74420
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-74420
- OSV: https://osv.dev/vulnerability/CVE-2026-74420

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-74420/
Summaries are generated and may contain mistakes; the official description above is the record.