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Vulnerability record · CVE-2026-31609 · published 24 April 2026

CVE-2026-31609: Linux kernel double free vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.67% · top 50.0% CWE-415 · Double free
9.8CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107 Patch
https://git.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be Patch
https://git.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607 Patch
https://git.kernel.org/stable/c/f9a162c2bbcd0ac85bd07c5b37cf20286048b65c Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31609), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.