# CVE-2022-49833: btrfs: zoned: clone zoned device info when cloning a device

> A null pointer dereference in the Linux kernel's btrfs zoned filesystem code can cause a system crash when cloning devices.

- **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 2025
- **Updated:** 15 Aug 2026
- **Also known as:** AZL-69917, DEBIAN-CVE-2022-49833, GHSA-qq9j-c8r5-5xf6, ROOT-OS-UBUNTU-2204-CVE-2022-49833, UBUNTU-CVE-2022-49833

## What is CVE-2022-49833?

CVE-2022-49833 is a medium-severity vulnerability in Linux kernel, published on 1 May 2025. 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:

btrfs: zoned: clone zoned device info when cloning a device

When cloning a btrfs_device, we're not cloning the associated
btrfs_zoned_device_info structure of the device in case of a zoned
filesystem.

Later on this leads to a NULL pointer dereference when accessing the
device's zone_info for instance when setting a zone as active.

This was uncovered by fstests' testcase btrfs/161.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2022-49833?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2022-49833?

Apply the vendor's patch.

## Is CVE-2022-49833 being exploited?

There is no known exploitation of CVE-2022-49833 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-2022-49833 and fix it if it is affected.

What it is: CVE-2022-49833 is a medium-severity vulnerability in Linux kernel, published on 1 May 2025. 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-2022-49833 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-2022-49833/ (Markdown: https://insights.sbomify.com/CVE-2022-49833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-49833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-49833
- OSV: https://osv.dev/vulnerability/CVE-2022-49833

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-49833/
Summaries are generated and may contain mistakes; the official description above is the record.