# CVE-2026-31609

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## Description

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

smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()

smbd_send_batch_flush() already calls smbd_free_send_io(),
so we should not call it again after smbd_post_send()
moved it to the batch list.

## Key facts

- **CVE ID:** CVE-2026-31609
- **Published:** 2026-04-24
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** CWE-415

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31609

## Citation

> AI Analytics. CVE-2026-31609. Retrieved 2026-07-24 from https://api.ai-analytics.org/cve/CVE-2026-31609. Derived from NIST NVD. Licensed CC0.

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