wsl-pro-service: Ubuntu Pro token exposed via process command-line arguments

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Summary

CVECVE-2026-102371
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-29 15:17:17 UTC
Updated2026-09-30 16:17:06 UTC
DescriptionIn wsl-pro-service before 0.1.19ubuntu3, the service component which runs as root inside each WSL instance attaches the instance to Ubuntu Pro by executing the pro client with the Ubuntu Pro token passed as a command-line argument (pro attach <token>). On systems where /proc is mounted without process-hiding mitigations (such as hidepid), which is the default in WSL, an unprivileged local user or process in the same WSL instance can read the token from /proc/<pid>/cmdline while the attach process is running. The leaked token could then be used to attach other machines to the victim's Ubuntu Pro subscription and gain unauthorized access to Ubuntu Pro services.

Risk And Classification

Primary CVSS: v4.0 5.7 MEDIUM from [email protected]

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-214 | CWE-214 CWE-214 Invocation of process using visible sensitive information

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.7MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS5.7MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Canonical Ubuntu Pro For WSL affected 0.1.1 0.1.19ubuntu2 ubuntu-resolute Linux
CNA Canonical Ubuntu Pro For WSL affected 0.1.1 0.1.18~24.04.3 ubuntu-noble Linux
CNA Canonical Ubuntu Pro For WSL affected 0.1.1 0.1.18~22.04.2 ubuntu-jammy Linux
CNA Canonical Ubuntu Pro For WSL affected 0.1.1 0.1.18~20.04.2 ubuntu-focal Linux

References

ReferenceSourceLinkTags
ubuntu.com/security/CVE-2026-102371 [email protected] ubuntu.com
github.com/canonical/ubuntu-pro-for-wsl/pull/1816 [email protected] github.com
github.com/canonical/ubuntu-pro-for-wsl/commit/11c164a37b806bcf2a2304beb... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Darshan U (en)

CNA: Carlos Nihelton (en)

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