Bug 2567980 (CVE-2026-85068)

Summary: CVE-2026-85068 nut: nut: Information disclosure via uninitialized stack memory in blazer_usb driver
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Network UPS Tools (NUT). When communicating with certain devices via the blazer_usb driver, fixed-size data packets are transmitted across the USB bus without completely initializing the memory buffer. An attacker with physical access can connect a malicious USB device to capture uninitialized stack memory during normal device polling, resulting in information disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2568081, 2568082    
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Description OSIDB Bzimport 2026-11-05 23:11:14 UTC 
Network UPS Tools is a collection of programs which provide a common interface for monitoring and administering UPS, PDU and SCD hardware. From 2.4.2 through 2.8.5, ippon_command in drivers/blazer_usb.c partially initializes char tmp[64] with a short Megatec status query and then passes a fixed eight-byte chunk to usb_control_msg. A malicious firmware-controlled USB device presenting the Mustek Powermust VID 0x06da and Mustek Powermust PID 0x0003 matches blazer_usb_id, selects ippon_subdriver, and can receive the uninitialized trailing stack bytes during normal polling. The disclosure is bounded and read-only, requires physical or supply-chain access to the USB bus, and has no established integrity or availability impact. This issue is scheduled to be fixed in version 2.8.6.