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CVE-2026-64391

CRITICAL CVSS: 9.8 Published: 2026-07-25 Modified: 2026-08-17

Description

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.

Affected Platforms

Unknown

Weakness Type

Unknown

References