# CVE-2024-26936: ksmbd: validate request buffer size in smb2_allocate_rsp_buf()

> An out-of-bounds write in the Linux kernel ksmbd module allows attackers to cause memory corruption, potentially leading to code execution or system crashes.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:** 1 May 2024
- **Updated:** 5 Aug 2026
- **Also known as:** BELL-CVE-2024-26936, DEBIAN-CVE-2024-26936, GHSA-54v9-xvg8-m8r8, UBUNTU-CVE-2024-26936

## What is CVE-2024-26936?

CVE-2024-26936 is a high-severity memory corruption vulnerability in Linux kernel, published on 1 May 2024. 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:

ksmbd: validate request buffer size in smb2_allocate_rsp_buf()

The response buffer should be allocated in smb2_allocate_rsp_buf
before validating request. But the fields in payload as well as smb2 header
is used in smb2_allocate_rsp_buf(). This patch add simple buffer size
validation to avoid potencial out-of-bounds in request buffer.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2024-26936?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-26936?

Apply the vendor's patch.

## Is CVE-2024-26936 being exploited?

There is no known exploitation of CVE-2024-26936 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-2024-26936 and fix it if it is affected.

What it is: CVE-2024-26936 is a high-severity memory corruption vulnerability in Linux kernel, published on 1 May 2024. 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-2024-26936 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-2024-26936/ (Markdown: https://insights.sbomify.com/CVE-2024-26936/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-26936
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-26936
- OSV: https://osv.dev/vulnerability/CVE-2024-26936

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-26936/
Summaries are generated and may contain mistakes; the official description above is the record.