# CVE-2026-31713: fuse: abort on fatal signal during sync init

> A flaw in the Linux kernel FUSE implementation causes a hang during filesystem initialization if the server exits unexpectedly, leading to denial of service.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **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:** 1 May 2026
- **Updated:** 14 Jun 2026
- **Also known as:** BELL-CVE-2026-31713, DEBIAN-CVE-2026-31713, GHSA-p5ww-jrfv-82qx, UBUNTU-CVE-2026-31713

## What is CVE-2026-31713?

CVE-2026-31713 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 May 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:

fuse: abort on fatal signal during sync init

When sync init is used and the server exits for some reason (error, crash)
while processing FUSE_INIT, the filesystem creation will hang.  The reason
is that while all other threads will exit, the mounting thread (or process)
will keep the device fd open, which will prevent an abort from happening.

This is a regression from the async mount case, where the mount was done
first, and the FUSE_INIT processing afterwards, in which case there's no
such recursive syscall keeping the fd open.

## Which versions are affected by CVE-2026-31713?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2026-31713?

Apply the vendor's patch.

## Is CVE-2026-31713 being exploited?

There is no known exploitation of CVE-2026-31713 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-2026-31713 and fix it if it is affected.

What it is: CVE-2026-31713 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 May 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-2026-31713 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-2026-31713/ (Markdown: https://insights.sbomify.com/CVE-2026-31713/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-31713
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31713
- OSV: https://osv.dev/vulnerability/CVE-2026-31713

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-31713/
Summaries are generated and may contain mistakes; the official description above is the record.