# CVE-2022-21546: scsi: target: Fix WRITE_SAME No Data Buffer crash

> A null pointer dereference in the Linux kernel SCSI target subsystem allows a local attacker to cause a system crash via crafted WRITE_SAME commands.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 2 May 2025
- **Updated:** 5 Aug 2026
- **Also known as:** DEBIAN-CVE-2022-21546, GHSA-4f99-6w2j-877c, ROOT-OS-DEBIAN-11-CVE-2022-21546, ROOT-OS-UBUNTU-2204-CVE-2022-21546, UBUNTU-CVE-2022-21546

## What is CVE-2022-21546?

CVE-2022-21546 is a high-severity vulnerability in Debian Debian Linux, published on 2 May 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:

scsi: target: Fix WRITE_SAME No Data Buffer crash

In newer version of the SBC specs, we have a NDOB bit that indicates there
is no data buffer that gets written out. If this bit is set using commands
like "sg_write_same --ndob" we will crash in target_core_iblock/file's
execute_write_same handlers when we go to access the se_cmd->t_data_sg
because its NULL.

This patch adds a check for the NDOB bit in the common WRITE SAME code
because we don't support it. And, it adds a check for zero SG elements in
each handler in case the initiator tries to send a normal WRITE SAME with
no data buffer.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2022-21546?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2022-21546?

Apply the vendor's patch.

## Is CVE-2022-21546 being exploited?

There is no known exploitation of CVE-2022-21546 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

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- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-21546 and fix it if it is affected.

What it is: CVE-2022-21546 is a high-severity vulnerability in Debian Debian Linux, published on 2 May 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-2022-21546 in the wild and no public exploit code.

Affected product: Debian Debian 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-2022-21546/ (Markdown: https://insights.sbomify.com/CVE-2022-21546/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-21546
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-21546
- OSV: https://osv.dev/vulnerability/CVE-2022-21546

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-21546/
Summaries are generated and may contain mistakes; the official description above is the record.