# CVE-2024-26980: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf

> A slab-out-of-bounds read in the Linux kernel ksmbd module allows attackers to cause denial of service or read sensitive memory.

- **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-2024-26980, DEBIAN-CVE-2024-26980, GHSA-rmx7-cw76-79w4, UBUNTU-CVE-2024-26980

## What is CVE-2024-26980?

CVE-2024-26980 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: fix slab-out-of-bounds in smb2_allocate_rsp_buf

If ->ProtocolId is SMB2_TRANSFORM_PROTO_NUM, smb2 request size
validation could be skipped. if request size is smaller than
sizeof(struct smb2_query_info_req), slab-out-of-bounds read can happen in
smb2_allocate_rsp_buf(). This patch allocate response buffer after
decrypting transform request. smb3_decrypt_req() will validate transform
request size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2024-26980?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-26980?

Apply the vendor's patch.

## Is CVE-2024-26980 being exploited?

There is no known exploitation of CVE-2024-26980 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-2024-26980 and fix it if it is affected.

What it is: CVE-2024-26980 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-2024-26980 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-2024-26980/ (Markdown: https://insights.sbomify.com/CVE-2024-26980/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-26980
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-26980
- OSV: https://osv.dev/vulnerability/CVE-2024-26980

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-26980/
Summaries are generated and may contain mistakes; the official description above is the record.