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Vulnerability record · CVE-2026-64387 · published 25 July 2026

CVE-2026-64387: Linux kernel double free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_directory_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.

9.8 CVSS 3.1 Critical EPSS 0.46% · top 62.9% CWE-415 · Double free
9.8CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
4 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_directory_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.

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/00b0fa425941438b664950a8ee65dfba2def4336 Patch
https://git.kernel.org/stable/c/1665f25b1dea30bf2d02e16245d203a944c9d994 Patch
https://git.kernel.org/stable/c/3317a5d015fca976475aa71df224056777316fde Patch
https://git.kernel.org/stable/c/3409aedf3c81a810243da94164f6621c9d205c98 Patch
https://git.kernel.org/stable/c/9647492b5e41954be59d5157eddbcd4cdc1656f7 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64387), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.