NUT blazer_usb ippon_command stack info-leak via unzeroed char tmp[64] in OUT-direction usb_control_msg

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85068
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-05 23:17:00 UTC
Updated2026-11-12 22:18:51 UTC
DescriptionNetwork 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.

Risk And Classification

Primary CVSS: v3.1 2.4 LOW from [email protected]

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.001510000 probability, percentile 0.042730000 (date 2026-11-14)

Problem Types: CWE-457 | CWE-457 CWE-457: Use of Uninitialized Variable

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary2.4LOWCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED2.4LOWCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Networkupstools Nut affected >= 2.4.2, <= 2.8.5 Not specified

References

ReferenceSourceLinkTags
github.com/networkupstools/nut/commit/30d56d4282f823949b40763d5c76461c7d... [email protected] github.com
github.com/networkupstools/nut/security/advisories/GHSA-fjxc-2vpv-mqc8 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/networkupstools/nut/pull/3529 [email protected] github.com
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