# CVE-2026-64382: smb: client: fix double-free in SMB2_open() replay

> A double-free vulnerability in the Linux kernel SMB client allows attackers to cause denial of service or potentially execute code via crafted SMB responses.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 25 Jul 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-93671, BELL-CVE-2026-64382, DEBIAN-CVE-2026-64382, GHSA-9v59-2cj8-p55r, ROOT-OS-UBUNTU-2204-CVE-2026-64382, UBUNTU-CVE-2026-64382

## What is CVE-2026-64382?

CVE-2026-64382 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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

smb: client: fix double-free in SMB2_open() replay

A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_open_init() fails before the next send, cleanup
retains the previous buffer type and frees that response again.

Reset response bookkeeping before each attempt to prevent the stale free.

Weakness: CWE-415 (Double Free)

## Which versions are affected by CVE-2026-64382?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2026-64382?

Apply the vendor's patch.

## Is CVE-2026-64382 being exploited?

There is no known exploitation of CVE-2026-64382 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-64382 and fix it if it is affected.

What it is: CVE-2026-64382 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-64382 in the wild and no public exploit code.

Affected product: Linux kernel. 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-2026-64382/ (Markdown: https://insights.sbomify.com/CVE-2026-64382/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-64382
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64382
- OSV: https://osv.dev/vulnerability/CVE-2026-64382

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-64382/
Summaries are generated and may contain mistakes; the official description above is the record.