# CVE-2023-1194: Use-after-free in parse_lease_state()

> An attacker can trigger a use-after-free in the Linux kernel's KSMBD server via a malformed CREATE command, potentially leading to code execution or system crash.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Nov 2023
- **Updated:** 13 Feb 2025
- **Also known as:** AZL-31893, DEBIAN-CVE-2023-1194, GHSA-53pc-8xr3-68wx, UBUNTU-CVE-2023-1194

## What is CVE-2023-1194?

CVE-2023-1194 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 3 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An out-of-bounds (OOB) memory read flaw was found in parse_lease_state in the KSMBD implementation of the in-kernel samba server and CIFS in the Linux kernel. When an attacker sends the CREATE command with a malformed payload to KSMBD, due to a missing check of `NameOffset` in the `parse_lease_state()` function, the `create_context` object can access invalid memory.

Weakness: CWE-125 (Out-of-bounds Read), CWE-416 (Use After Free)

## Which versions are affected by CVE-2023-1194?

It affects 2 products.


Products: Fedoraproject Fedora, Linux kernel.

## How do I fix CVE-2023-1194?

Apply the vendor's patch.

## Is CVE-2023-1194 being exploited?

There is no known exploitation of CVE-2023-1194 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-2023-1194 and fix it if it is affected.

What it is: CVE-2023-1194 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 3 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-1194 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-2023-1194/ (Markdown: https://insights.sbomify.com/CVE-2023-1194/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-1194
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-1194
- OSV: https://osv.dev/vulnerability/CVE-2023-1194

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-1194/
Summaries are generated and may contain mistakes; the official description above is the record.