Linux Kernel ksmbd SMB server Vulnerability Rated 7.5 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-31612

Key Details

CVE	CVE-2026-31612
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is none; availability impact is none.
Affected products	Linux Kernel and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Exploitation prediction (EPSS)	0.58% probability of exploitation in the next 30 days (46% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Siemens

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Subsystems	Controllers & Field I/O, OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: validate EaNameLength in smb2_get_ea()

smb2_get_ea() reads ea_req->EaNameLength from the client request and

passes it directly to strncmp() as the comparison length without

verifying that the length of the name really is the size of the input

buffer received.

Fix this up by properly checking the size of the name based on the value

received and the overall size of the request, to prevent a later

strncmp() call to use the length as a "trusted" size of the buffer.

Without this check, uninitialized heap values might be slowly leaked to

the client. (NVD)

Monitor Linux's and Siemens's web pages for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-31612
CVE	https://www.cve.org/CVERecord?id=CVE-2026-31612

Source

Reference

NVD

CVE