CVE-2026-64391

Last refreshed2026-10-23

Status: UPDATED | Advisory ID: CVE-2026-64391

Key Details

CVE	CVE-2026-64391
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-21
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
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 high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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

ksmbd: use opener credentials for ADS I/O

Alternate data streams are stored as xattrs. Unlike regular file I/O,

their read and write paths therefore call VFS xattr helpers which recheck

inode permissions and LSM policy using the current task credentials.

Run ADS I/O with the credentials captured when the SMB handle was opened. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-64391
CVE	https://www.cve.org/CVERecord?id=CVE-2026-64391

Source

Reference

NVD

CVE