# CVE-2026-31608: smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()

CVE-2026-31608 is fixed in linux on 1 platform by DEBIAN-CVE-2026-31608 (version 6.19.14-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-31608
- Priority: High
- CVSS: 9.8 (Important)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31608

## Description

In the Linux kernel, the following vulnerability has been resolved:  smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()  smb_direct_flush_send_list() already calls smb_direct_free_sendmsg(), so we should not call it again after post_sendmsg() moved it to the batch list.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.19.14-1 | [DEBIAN-CVE-2026-31608](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31608.md) | May 15, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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