Incorrect permission assignment for critical resource in Linux kernel - CVE-2026-93786
Published: September 25, 2026
Vulnerability identifier: #VU152102
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93786
CWE-ID: CWE-732
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to widen effective permissions on SMB-created objects.
The vulnerability exists due to improper permission assignment in the ksmbd VFS POSIX ACL inheritance handling when creating SMB objects in directories with default POSIX ACLs. A remote user can create an SMB object to widen effective permissions on that object.
Exploitation requires a parent directory with a default POSIX ACL containing a restrictive ACL_MASK entry.
Affected software
Linux kernel
How to mitigate CVE-2026-93786
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3