# CVE-2023-39191: Kernel: ebpf: insufficient stack type checks in dynptr

> An attacker with CAP_BPF privileges can escalate privileges and execute arbitrary code in the kernel due to insufficient validation of dynamic pointers in eBPF programs.

- **Severity:** High 8.2 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Oct 2023
- **Updated:** 6 Nov 2025
- **Also known as:** AZL-31150, BELL-CVE-2023-39191, DEBIAN-CVE-2023-39191, GHSA-gxg7-pxwf-9r28, ROOT-OS-DEBIAN-12-CVE-2023-39191, UBUNTU-CVE-2023-39191

## What is CVE-2023-39191?

CVE-2023-39191 is a high-severity vulnerability in Fedoraproject Fedora, published on 4 Oct 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An improper input validation flaw was found in the eBPF subsystem in the Linux kernel. The issue occurs due to a lack of proper validation of dynamic pointers within user-supplied eBPF programs prior to executing them. This may allow an attacker with CAP_BPF privileges to escalate privileges and execute arbitrary code in the context of the kernel.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2023-39191?

It affects 3 products.


Products: Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.

## How do I fix CVE-2023-39191?

Apply the vendor's patch.

## Is CVE-2023-39191 being exploited?

There is no known exploitation of CVE-2023-39191 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-39191 and fix it if it is affected.

What it is: CVE-2023-39191 is a high-severity vulnerability in Fedoraproject Fedora, published on 4 Oct 2023. 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-2023-39191 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2023-39191/ (Markdown: https://insights.sbomify.com/CVE-2023-39191/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-39191
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-39191
- OSV: https://osv.dev/vulnerability/CVE-2023-39191

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-39191/
Summaries are generated and may contain mistakes; the official description above is the record.