Improper access control in fwupd - #VU140590
Published: July 26, 2026 / Updated: July 31, 2026
Vulnerability identifier: #VU140590
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
fwupd
fwupd
Detailed vulnerability description
The vulnerability allows a remote user to mutate live device state and block a later legitimate update.
The vulnerability exists due to improper state management in the D-Bus install path when processing an unsigned archive before polkit authorization and trust validation. A remote user can submit a crafted archive to mutate live device state and block a later legitimate update.
Scope is limited to affected MD_SET_* device classes and unconditionally copied fields. The rejecting install attempt can occur without a polkit call.
Remediation
Install security update from vendor's website.