FKIE_CVE-2026-9494
Vulnerability from fkie_nvd - Published: 2026-07-16 13:16 - Updated: 2026-07-16 16:19
Severity
Summary
An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT credentials by executing /usr/lib/apt/apt-helper using the download-file command. During this process, the secret bearer token is embedded directly in
the cleartext URL component passed via the command-line arguments (argv), resulting in a URL format such as https://bearer:<token>@esm.ubuntu.com/.../. On systems utilizing a default-mounted /proc file system where process-hiding mitigations (such as hidepid) are disabled, an unprivileged local attacker can
monitor system processes and read the sensitive bearer token directly from /proc/cmdline while the helper process is actively running. This leaked token can subsequently be used to gain unauthorized access to the victim's Ubuntu Pro or Expanded Security Maintenance (ESM) repositories.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://github.com/canonical/",
"defaultStatus": "unaffected",
"packageName": "ubuntu-pro-client",
"platforms": [
"Linux"
],
"product": "ubuntu-pro-client (ubuntu-advantage-tools)",
"repo": "https://github.com/canonical/ubuntu-pro-client",
"vendor": "Canonical",
"versions": [
{
"lessThan": "37.3",
"status": "affected",
"version": "0",
"versionType": "python"
}
]
},
{
"collectionURL": "https://launchpad.net/ubuntu/resolute",
"defaultStatus": "affected",
"packageName": "ubuntu-advantage-tools",
"platforms": [
"Linux"
],
"product": "Ubuntu 26.04 LTS",
"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools",
"vendor": "Canonical",
"versions": [
{
"status": "unaffected",
"version": "37.2ubuntu0.1",
"versionType": "dpkg"
}
]
},
{
"collectionURL": "https://launchpad.net/ubuntu/noble",
"defaultStatus": "affected",
"packageName": "ubuntu-advantage-tools",
"platforms": [
"Linux"
],
"product": "Ubuntu 24.04 LTS",
"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools",
"vendor": "Canonical",
"versions": [
{
"status": "unaffected",
"version": "37.2ubuntu~24.04.1",
"versionType": "dpkg"
}
]
},
{
"collectionURL": "https://launchpad.net/ubuntu/jammy",
"defaultStatus": "affected",
"packageName": "ubuntu-advantage-tools",
"platforms": [
"Linux"
],
"product": "Ubuntu 22.04 LTS",
"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools",
"vendor": "Canonical",
"versions": [
{
"status": "unaffected",
"version": "37.2ubuntu~22.04.1",
"versionType": "dpkg"
}
]
},
{
"collectionURL": "https://launchpad.net/ubuntu/focal",
"defaultStatus": "affected",
"packageName": "ubuntu-advantage-tools",
"platforms": [
"Linux"
],
"product": "Ubuntu 20.04 LTS",
"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools",
"vendor": "Canonical",
"versions": [
{
"status": "unaffected",
"version": "37.1ubuntu0~20.04.1",
"versionType": "dpkg"
}
]
},
{
"collectionURL": "https://launchpad.net/ubuntu/bionic",
"defaultStatus": "affected",
"packageName": "ubuntu-advantage-tools",
"platforms": [
"Linux"
],
"product": "Ubuntu 18.04 LTS",
"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools",
"vendor": "Canonical",
"versions": [
{
"status": "unaffected",
"version": "37.1ubuntu0~18.04.1",
"versionType": "dpkg"
}
]
},
{
"collectionURL": "https://launchpad.net/ubuntu/xenial",
"defaultStatus": "affected",
"packageName": "ubuntu-advantage-tools",
"platforms": [
"Linux"
],
"product": "Ubuntu 16.04 LTS",
"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools",
"vendor": "Canonical",
"versions": [
{
"status": "unaffected",
"version": "37.1ubuntu0~16.04.1",
"versionType": "dpkg"
}
]
},
{
"collectionURL": "https://launchpad.net/ubuntu/trusty",
"defaultStatus": "affected",
"packageName": "ubuntu-advantage-tools",
"platforms": [
"Linux"
],
"product": "Ubuntu 14.04 LTS",
"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools",
"vendor": "Canonical",
"versions": [
{
"status": "unaffected",
"version": "19.7ubuntu0.1",
"versionType": "dpkg"
}
]
}
],
"source": "security@ubuntu.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT credentials by executing /usr/lib/apt/apt-helper using the download-file command. During this process, the secret bearer token is embedded directly in\nthe cleartext URL component passed via the command-line arguments (argv), resulting in a URL format such as https://bearer:\u003ctoken\u003e@esm.ubuntu.com/.../. On systems utilizing a default-mounted /proc file system where process-hiding mitigations (such as hidepid) are disabled, an unprivileged local attacker can\nmonitor system processes and read the sensitive bearer token directly from /proc/cmdline while the helper process is actively running. This leaked token can subsequently be used to gain unauthorized access to the victim\u0027s Ubuntu Pro or Expanded Security Maintenance (ESM) repositories."
}
],
"id": "CVE-2026-9494",
"lastModified": "2026-07-16T16:19:16.463",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "security@ubuntu.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-9494",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-16T13:36:06.361605Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-16T13:16:34.520",
"references": [
{
"source": "security@ubuntu.com",
"url": "https://ubuntu.com/security/CVE-2026-9494"
}
],
"sourceIdentifier": "security@ubuntu.com",
"vulnStatus": "Undergoing Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-214"
}
],
"source": "security@ubuntu.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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