# CVE-2023-32247: Session setup memory exhaustion denial-of-service vulnerability

> An attacker can cause a denial-of-service condition in the Linux kernel's ksmbd server by exhausting memory during SMB2 session setup.

- **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-27643, AZL-27765, DEBIAN-CVE-2023-32247, GHSA-ph9g-g7m5-2pg5, UBUNTU-CVE-2023-32247

## What is CVE-2023-32247?

CVE-2023-32247 is a high-severity denial of service 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_SESSION_SETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Weakness: CWE-401 (Missing Release of Memory after Effective Lifetime)

## Which versions are affected by CVE-2023-32247?

It affects 5 products.


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

## How do I fix CVE-2023-32247?

Apply the vendor's patch.

## Is CVE-2023-32247 being exploited?

There is no known exploitation of CVE-2023-32247 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-2023-32247 and fix it if it is affected.

What it is: CVE-2023-32247 is a high-severity denial of service 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-2023-32247 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-2023-32247/ (Markdown: https://insights.sbomify.com/CVE-2023-32247/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-32247
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-32247
- OSV: https://osv.dev/vulnerability/CVE-2023-32247

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-32247/
Summaries are generated and may contain mistakes; the official description above is the record.