# CVE-2022-50764: ipv6/sit: use DEV_STATS_INC() to avoid data-races

> A race condition in the Linux kernel's IPv6 SIT tunnel driver can cause concurrent updates to error statistics, potentially leading to system instability or denial of service.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Dec 2025
- **Updated:** 11 May 2026
- **Also known as:** DEBIAN-CVE-2022-50764, GHSA-grmr-47cc-4gc2, ROOT-OS-DEBIAN-11-CVE-2022-50764, UBUNTU-CVE-2022-50764

## What is CVE-2022-50764?

CVE-2022-50764 is a vulnerability in Linux, published on 24 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

ipv6/sit: use DEV_STATS_INC() to avoid data-races

syzbot/KCSAN reported that multiple cpus are updating dev->stats.tx_error
concurrently.

This is because sit tunnels are NETIF_F_LLTX, meaning their ndo_start_xmit()
is not protected by a spinlock.

While original KCSAN report was about tx path, rx path has the same issue.

## Which versions are affected by CVE-2022-50764?


## How do I fix CVE-2022-50764?

Apply the vendor's patch.

## Is CVE-2022-50764 being exploited?

There is no known exploitation of CVE-2022-50764 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-50764 and fix it if it is affected.

What it is: CVE-2022-50764 is a vulnerability in Linux, published on 24 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-50764 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-2022-50764/ (Markdown: https://insights.sbomify.com/CVE-2022-50764/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-50764
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-50764
- OSV: https://osv.dev/vulnerability/CVE-2022-50764

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-50764/
Summaries are generated and may contain mistakes; the official description above is the record.