# CVE-2023-32252: Session null pointer dereference denial-of-service vulnerability

> An attacker can cause a denial of service in the Linux kernel's ksmbd server by triggering a null pointer dereference during SMB2 logoff.

- **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:** 24 Jul 2023
- **Updated:** 2 Aug 2024
- **Also known as:** AZL-27635, AZL-27757, DEBIAN-CVE-2023-32252, GHSA-wxv8-6x37-53r6, UBUNTU-CVE-2023-32252

## What is CVE-2023-32252?

CVE-2023-32252 is a high-severity vulnerability in Linux kernel, published on 24 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_LOGOFF commands. The issue results from the lack of proper validation of a pointer prior to accessing it. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2023-32252?

It affects 6 products.


Products: Linux kernel, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500s Firmware, Netapp H700s Firmware.

## How do I fix CVE-2023-32252?

Apply the vendor's patch.

## Is CVE-2023-32252 being exploited?

There is no known exploitation of CVE-2023-32252 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-2023-32252 and fix it if it is affected.

What it is: CVE-2023-32252 is a high-severity vulnerability in Linux kernel, published on 24 Jul 2023. 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-2023-32252 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-2023-32252/ (Markdown: https://insights.sbomify.com/CVE-2023-32252/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-32252
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-32252
- OSV: https://osv.dev/vulnerability/CVE-2023-32252

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-32252/
Summaries are generated and may contain mistakes; the official description above is the record.