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Vulnerability record · CVE-2026-31608 · published 24 April 2026

CVE-2026-31608: Linux kernel double free vulnerability

Linux · Linux Kernel

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.

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: 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.

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/2ba03f46132b0d1a7bafb86e1ef61951a2254023 Patch
https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25 Patch
https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032 Patch
https://git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31608), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.