CVE-2026-12391

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-12391", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "state": "PUBLISHED", "assignerShortName": "canonical", "dateReserved": "2026-06-16T12:15:12.153Z", "datePublished": "2026-07-16T12:17:01.094Z", "dateUpdated": "2026-07-16T13:28:19.156Z"}, "containers": {"cna": {"title": "ubuntu-pro-client Local Privilege Escalation and Information Disclosure via Symlink Arbitrary File Read in collect-logs", "datePublic": "2026-07-16T12:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-59", "description": "CWE-59 Improper link resolution before file access ('link following')", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-132", "descriptions": [{"lang": "en", "value": "CAPEC-132 Symlink Attack"}]}], "affected": [{"vendor": "Canonical", "product": "ubuntu-pro-client (ubuntu-advantage-tools)", "platforms": ["Linux"], "collectionURL": "https://github.com/canonical/", "packageName": "ubuntu-pro-client", "repo": "https://github.com/canonical/ubuntu-pro-client", "versions": [{"status": "affected", "version": "0", "lessThan": "37.3", "versionType": "python"}], "defaultStatus": "unaffected"}, {"vendor": "Canonical", "product": "Ubuntu 26.04 LTS", "platforms": ["Linux"], "collectionURL": "https://launchpad.net/ubuntu/resolute", "packageName": "ubuntu-advantage-tools", "repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "versions": [{"status": "unaffected", "version": "37.2ubuntu0.1", "versionType": "dpkg"}], "defaultStatus": "affected"}, {"vendor": "Canonical", "product": "Ubuntu 24.04 LTS", "platforms": ["Linux"], "collectionURL": "https://launchpad.net/ubuntu/noble", "packageName": "ubuntu-advantage-tools", "repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "versions": [{"status": "unaffected", "version": "37.2ubuntu~24.04.1", "versionType": "dpkg"}], "defaultStatus": "affected"}, {"vendor": "Canonical", "product": "Ubuntu 22.04 LTS", "platforms": ["Linux"], "collectionURL": "https://launchpad.net/ubuntu/jammy", "packageName": "ubuntu-advantage-tools", "repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "versions": [{"status": "unaffected", "version": "37.2ubuntu~22.04.1", "versionType": "dpkg"}], "defaultStatus": "affected"}, {"vendor": "Canonical", "product": "Ubuntu 20.04 LTS", "platforms": ["Linux"], "collectionURL": "https://launchpad.net/ubuntu/focal", "packageName": "ubuntu-advantage-tools", "repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "versions": [{"status": "unaffected", "version": "37.1ubuntu0~20.04.1", "versionType": "dpkg"}], "defaultStatus": "affected"}, {"vendor": "Canonical", "product": "Ubuntu 18.04 LTS", "platforms": ["Linux"], "collectionURL": "https://launchpad.net/ubuntu/bionic", "packageName": "ubuntu-advantage-tools", "repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "versions": [{"status": "unaffected", "version": "37.1ubuntu0~18.04.1", "versionType": "dpkg"}], "defaultStatus": "affected"}, {"vendor": "Canonical", "product": "Ubuntu 16.04 LTS", "platforms": ["Linux"], "collectionURL": "https://launchpad.net/ubuntu/xenial", "packageName": "ubuntu-advantage-tools", "repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "versions": [{"status": "unaffected", "version": "37.1ubuntu0~16.04.1", "versionType": "dpkg"}], "defaultStatus": "affected"}], "descriptions": [{"lang": "en", "value": "An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic information without verifying the file type or ownership. An unprivileged local attacker can exploit this behavior by creating a symbolic link (symlink) at a predictable destination path pointing to an arbitrary, root-readable file (such as /etc/shadow or private files within /root). When a root administrator or operator subsequently executes the pro collect-logs command, the tool follows the user-controlled symlink, reads the target file, and compresses its contents into the resulting diagnostic support archive. Because the output archive remains readable by the unprivileged user, the attacker can extract and read the sensitive root-owned files, leading to a complete information disclosure of system secrets.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "An insecure symlink following vulnerability exists in Canonical<br>ubuntu-pro-client (formerly ubuntu-advantage-tools) within the<br>pro collect-logs command framework. The utility creates or utilizes<br>predictable temporary file paths or user-accessible log directories when<br>gathering diagnostic information without verifying the file type or ownership.<br>An unprivileged local attacker can exploit this behavior by creating a<br>symbolic link (symlink) at a predictable destination path pointing to an<br>arbitrary, root-readable file (such as /etc/shadow or private files within<br>/root).<br>When a root administrator or operator subsequently executes the<br>pro collect-logs command, the tool follows the user-controlled symlink, reads<br>the target file, and compresses its contents into the resulting diagnostic<br>support archive. Because the output archive remains readable by the<br>unprivileged user, the attacker can extract and read the sensitive root-owned<br>files, leading to a complete information disclosure of system secrets.<br>"}]}], "references": [{"url": "https://ubuntu.com/security/CVE-2026-12391", "tags": ["vdb-entry"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 5, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N"}}], "credits": [{"lang": "en", "value": "Mateusz Gierblinski", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-07-16T12:17:01.094Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-16T13:20:30.714803Z", "id": "CVE-2026-12391", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-16T13:28:19.156Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-12391", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-16T13:20:30.714803Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-16T13:27:50.388Z"}}], "cna": {"title": "ubuntu-pro-client Local Privilege Escalation and Information Disclosure via Symlink Arbitrary File Read in collect-logs", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Mateusz Gierblinski"}], "impacts": [{"capecId": "CAPEC-132", "descriptions": [{"lang": "en", "value": "CAPEC-132 Symlink Attack"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/canonical/ubuntu-pro-client", "vendor": "Canonical", "product": "ubuntu-pro-client (ubuntu-advantage-tools)", "versions": [{"status": "affected", "version": "0", "lessThan": "37.3", "versionType": "python"}], "platforms": ["Linux"], "packageName": "ubuntu-pro-client", "collectionURL": "https://github.com/canonical/", "defaultStatus": "unaffected"}, {"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "vendor": "Canonical", "product": "Ubuntu 26.04 LTS", "versions": [{"status": "unaffected", "version": "37.2ubuntu0.1", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "ubuntu-advantage-tools", "collectionURL": "https://launchpad.net/ubuntu/resolute", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "vendor": "Canonical", "product": "Ubuntu 24.04 LTS", "versions": [{"status": "unaffected", "version": "37.2ubuntu~24.04.1", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "ubuntu-advantage-tools", "collectionURL": "https://launchpad.net/ubuntu/noble", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "vendor": "Canonical", "product": "Ubuntu 22.04 LTS", "versions": [{"status": "unaffected", "version": "37.2ubuntu~22.04.1", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "ubuntu-advantage-tools", "collectionURL": "https://launchpad.net/ubuntu/jammy", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "vendor": "Canonical", "product": "Ubuntu 20.04 LTS", "versions": [{"status": "unaffected", "version": "37.1ubuntu0~20.04.1", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "ubuntu-advantage-tools", "collectionURL": "https://launchpad.net/ubuntu/focal", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "vendor": "Canonical", "product": "Ubuntu 18.04 LTS", "versions": [{"status": "unaffected", "version": "37.1ubuntu0~18.04.1", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "ubuntu-advantage-tools", "collectionURL": "https://launchpad.net/ubuntu/bionic", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/ubuntu-advantage-tools", "vendor": "Canonical", "product": "Ubuntu 16.04 LTS", "versions": [{"status": "unaffected", "version": "37.1ubuntu0~16.04.1", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "ubuntu-advantage-tools", "collectionURL": "https://launchpad.net/ubuntu/xenial", "defaultStatus": "affected"}], "datePublic": "2026-07-16T12:00:00.000Z", "references": [{"url": "https://ubuntu.com/security/CVE-2026-12391", "tags": ["vdb-entry"]}], "descriptions": [{"lang": "en", "value": "An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic information without verifying the file type or ownership. An unprivileged local attacker can exploit this behavior by creating a symbolic link (symlink) at a predictable destination path pointing to an arbitrary, root-readable file (such as /etc/shadow or private files within /root). When a root administrator or operator subsequently executes the pro collect-logs command, the tool follows the user-controlled symlink, reads the target file, and compresses its contents into the resulting diagnostic support archive. Because the output archive remains readable by the unprivileged user, the attacker can extract and read the sensitive root-owned files, leading to a complete information disclosure of system secrets.", "supportingMedia": [{"type": "text/html", "value": "An insecure symlink following vulnerability exists in Canonical<br>ubuntu-pro-client (formerly ubuntu-advantage-tools) within the<br>pro collect-logs command framework. The utility creates or utilizes<br>predictable temporary file paths or user-accessible log directories when<br>gathering diagnostic information without verifying the file type or ownership.<br>An unprivileged local attacker can exploit this behavior by creating a<br>symbolic link (symlink) at a predictable destination path pointing to an<br>arbitrary, root-readable file (such as /etc/shadow or private files within<br>/root).<br>When a root administrator or operator subsequently executes the<br>pro collect-logs command, the tool follows the user-controlled symlink, reads<br>the target file, and compresses its contents into the resulting diagnostic<br>support archive. Because the output archive remains readable by the<br>unprivileged user, the attacker can extract and read the sensitive root-owned<br>files, leading to a complete information disclosure of system secrets.<br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-59", "description": "CWE-59 Improper link resolution before file access ('link following')"}]}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-07-16T12:17:01.094Z"}}}, "cveMetadata": {"cveId": "CVE-2026-12391", "state": "PUBLISHED", "dateUpdated": "2026-07-16T13:28:19.156Z", "dateReserved": "2026-06-16T12:15:12.153Z", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "datePublished": "2026-07-16T12:17:01.094Z", "assignerShortName": "canonical"}, "dataVersion": "5.2"}

{"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"}]}], "source": "security@ubuntu.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic information without verifying the file type or ownership. An unprivileged local attacker can exploit this behavior by creating a symbolic link (symlink) at a predictable destination path pointing to an arbitrary, root-readable file (such as /etc/shadow or private files within /root). When a root administrator or operator subsequently executes the pro collect-logs command, the tool follows the user-controlled symlink, reads the target file, and compresses its contents into the resulting diagnostic support archive. Because the output archive remains readable by the unprivileged user, the attacker can extract and read the sensitive root-owned files, leading to a complete information disclosure of system secrets."}], "id": "CVE-2026-12391", "lastModified": "2026-07-16T14:16:48.203", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 3.6, "source": "security@ubuntu.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12391", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-16T13:20:30.714803Z", "version": "2.0.3"}}]}, "published": "2026-07-16T13:16:24.930", "references": [{"source": "security@ubuntu.com", "url": "https://ubuntu.com/security/CVE-2026-12391"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-59"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["linux"], "status": "unaffected", "versions": {"scheme": "generic", "value": "37.2ubuntu0.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Ubuntu 26.04 LTS", "source": "cna", "vendor": "Canonical"}, "product": "ubuntu", "vendor": "canonical"}, {"configurations": [{"platform": ["linux"], "status": "unaffected", "versions": {"scheme": "generic", "value": "37.2ubuntu~24.04.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Ubuntu 24.04 LTS", "source": "cna", "vendor": "Canonical"}, "product": "ubuntu", "vendor": "canonical"}, {"configurations": [{"platform": ["linux"], "status": "unaffected", "versions": {"scheme": "generic", "value": "37.2ubuntu~22.04.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Ubuntu 22.04 LTS", "source": "cna", "vendor": "Canonical"}, "product": "ubuntu", "vendor": "canonical"}, {"configurations": [{"platform": ["linux"], "status": "unaffected", "versions": {"scheme": "generic", "value": "37.1ubuntu0~20.04.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Ubuntu 20.04 LTS", "source": "cna", "vendor": "Canonical"}, "product": "ubuntu", "vendor": "canonical"}, {"configurations": [{"platform": ["linux"], "status": "unaffected", "versions": {"scheme": "generic", "value": "37.1ubuntu0~18.04.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Ubuntu 18.04 LTS", "source": "cna", "vendor": "Canonical"}, "product": "ubuntu", "vendor": "canonical"}, {"configurations": [{"platform": ["linux"], "status": "unaffected", "versions": {"scheme": "generic", "value": "37.1ubuntu0~16.04.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Ubuntu 16.04 LTS", "source": "cna", "vendor": "Canonical"}, "product": "ubuntu", "vendor": "canonical"}, {"configurations": [{"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[0,37.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "ubuntu-pro-client (ubuntu-advantage-tools)", "source": "cna", "vendor": "Canonical"}, "product": "ubuntu-pro-client", "vendor": "canonical"}], "created": "2026-07-17T04:15:05.128081+00:00", "updated": "2026-07-31T02:15:06.298811+00:00", "vendors": ["canonical", "canonical$PRODUCT$ubuntu", "canonical$PRODUCT$ubuntu-pro-client"]}