# CVE-2026-90154: ksmbd: scope session state changes to bound connections

> A race condition in the Linux kernel ksmbd module allows attackers to disrupt SMB sessions, causing denial of service.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2026
- **Updated:** 21 Oct 2026
- **Also known as:** AZL-102420, BELL-CVE-2026-90154, DEBIAN-CVE-2026-90154, GHSA-c8qh-mfc7-v6c7, UBUNTU-CVE-2026-90154

## What is CVE-2026-90154?

CVE-2026-90154 is a vulnerability in Linux, published on 17 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: scope session state changes to bound connections

ksmbd_all_conn_set_status() treats every connection whose transient
binding flag is set as belonging to the target SessionId.  A logoff or
session replacement can consequently move an unrelated connection to
NEED_RECONNECT or NEED_SETUP.

Pass the target session itself and select connections using either the
connection-local session xarray or the session's permanent channel list.
Use the same association test while waiting for requests to drain.

Serialize session-wide status changes under request_lock and do not
overwrite EXITING or RELEASING. Protect the shutdown transition with the
same lock so a concurrent session update cannot revive a closing
connection.

## Which versions are affected by CVE-2026-90154?


## How do I fix CVE-2026-90154?

Apply the vendor's patch.

## Is CVE-2026-90154 being exploited?

There is no known exploitation of CVE-2026-90154 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90154 and fix it if it is affected.

What it is: CVE-2026-90154 is a vulnerability in Linux, published on 17 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-90154 in the wild and no public exploit code.

Affected product: Linux. 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-2026-90154/ (Markdown: https://insights.sbomify.com/CVE-2026-90154/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90154
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90154
- OSV: https://osv.dev/vulnerability/CVE-2026-90154

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90154/
Summaries are generated and may contain mistakes; the official description above is the record.