CVE-2026-64391
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
25/07/2026
Last modified:
27/07/2026
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
ksmbd: use opener credentials for ADS I/O<br />
<br />
Alternate data streams are stored as xattrs. Unlike regular file I/O,<br />
their read and write paths therefore call VFS xattr helpers which recheck<br />
inode permissions and LSM policy using the current task credentials.<br />
<br />
Run ADS I/O with the credentials captured when the SMB handle was opened.
Impact
Base Score 3.x
9.80
Severity 3.x
CRITICAL