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Vulnerability record · CVE-2026-64381 · published 25 July 2026

CVE-2026-64381: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receive_encrypted_standard() receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked. Move the MAX_COMPOUND check before allocating next_buffer.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receive_encrypted_standard() receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked. Move the MAX_COMPOUND check before allocating next_buffer.

CVSS:3.1/AV:L/AC:L/PR:L/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/07e0ab81df1790afa35732a4e8e07ff831b29008 Patch
https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b Patch
https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b Patch
https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83 Patch
https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974 Patch
https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b Patch
https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3 Patch
https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64381), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.