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Vulnerability record · CVE-2026-64257 · published 25 July 2026

CVE-2026-64257: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject overlapping data areas in SMB2 responses Commit 53b7c271f06b ("smb: client: restrict implied bcc[0] exemption to responses without data area") restricted the implied bcc[0] length exception to responses without a data area. However, the overlap handling in __smb2_calc_size() clears data_length, which can make an invalid response appear to have no data area and so qualify for the exception. Track data area overlap separately and reject such responses before applying the length compatibility exceptions.

9.1 CVSS 3.1 Critical EPSS 0.70% · top 48.7%
9.1CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject overlapping data areas in SMB2 responses Commit 53b7c271f06b ("smb: client: restrict implied bcc[0] exemption to responses without data area") restricted the implied bcc[0] length exception to responses without a data area. However, the overlap handling in __smb2_calc_size() clears data_length, which can make an invalid response appear to have no data area and so qualify for the exception. Track data area overlap separately and reject such responses before applying the length compatibility exceptions.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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/36bfa52459e45c0d5b668de2f1c91f6dc5c67775 Patch
https://git.kernel.org/stable/c/445ece263131780dee273d727a4d6f11934feec7 Patch
https://git.kernel.org/stable/c/4a9d2657d3e05f6ed09c148cb127b4e58702275f Patch
https://git.kernel.org/stable/c/57cba95f0e97c6f6e45e6731da30aff091bd7460 Patch
https://git.kernel.org/stable/c/8986c932905ea508d66da421eb2eb6e676ace1fe Patch
https://git.kernel.org/stable/c/fdafa1e68dc75045b7b617e6e7d2854950804d83 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64257), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.