CVE-2026-6970

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Linux"], "product": "authd", "vendor": "Canonical", "versions": [{"lessThan": "0.6.4", "status": "affected", "version": "0.6.0", "versionType": "semver"}, {"lessThan": "0.6.1ubuntu0.1", "status": "affected", "version": "0.6.1", "versionType": "ubuntu-resolute"}]}], "source": "security@ubuntu.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "authd prior to version 0.6.4 contains a logic error in primary group ID assignment that can lead to local privilege escalation. When a user's primary group ID (GID) differs from their UID, either because the account was created with authd prior to version 0.5.4 or because the primary group was manually changed via the `authctl group set-gid` command, and the user's identity provider record is updated, authd incorrectly resets the user's primary group ID to their UID upon next login. This causes newly created files and directories to be owned by the wrong group, causing denial of service issues, and potentially granting unintended access to other local users and allowing local privilege escalation."}, {"lang": "es", "value": "authd anterior a la versi\u00f3n 0.6.4 contiene un error l\u00f3gico en la asignaci\u00f3n del ID de grupo primario que puede conducir a una escalada de privilegios local. Cuando el ID de grupo primario (GID) de un usuario difiere de su UID, ya sea porque la cuenta fue creada con authd anterior a la versi\u00f3n 0.5.4 o porque el grupo primario fue cambiado manualmente a trav\u00e9s del comando \u2019authctl group set-gid\u2019, y el registro del proveedor de identidad del usuario se actualiza, authd restablece incorrectamente el ID de grupo primario del usuario a su UID en el siguiente inicio de sesi\u00f3n. Esto provoca que los archivos y directorios reci\u00e9n creados sean propiedad del grupo incorrecto, causando problemas de denegaci\u00f3n de servicio, y potencialmente otorgando acceso no intencionado a otros usuarios locales y permitiendo la escalada de privilegios local."}], "id": "CVE-2026-6970", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@ubuntu.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6970", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-27T16:16:37.315715Z", "version": "2.0.3"}}]}, "published": "2026-04-27T16:16:46.300", "references": [{"source": "security@ubuntu.com", "url": "https://github.com/canonical/authd/commit/154b428305cb1a7a19c897626fefd09d6dde8b9f"}, {"source": "security@ubuntu.com", "url": "https://github.com/canonical/authd/security/advisories/GHSA-fg3j-5w9g-hmg7"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-842"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[0.6.0,0.6.4)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[0.6.1,0.6.1ubuntu0.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "authd", "source": "cna", "vendor": "Canonical"}, "product": "authd", "vendor": "canonical"}], "analysis": {"en": {"generated_at": "2026-04-28T04:18:43.145598+00:00", "value": {"mitigation_remediation": ["Apply the latest Canonical authd update (0.6.4 or newer).", "For existing users affected by this logic error, reset their primary group ID to match their UID or recreate the account to correct ownership of new files. ", "Limit or audit use of the authctl group set\u2011gid command to prevent accidental or malicious group ID changes.", "Verify that any remaining users with mismatched UID/GID have been updated before they log in to prevent the flaw from activating."], "summary": {"action": "Apply Patch", "impact": "Local Privilege Escalation and Denial of Service"}, "threat_synthesis": {"affected_systems": "The affected product is Canonical\u2019s authd service. Versions prior to 0.6.4 are vulnerable, including those where accounts were created with older authd or where the primary group was manually altered with authctl group set\u2011gid.", "description_and_impact": "authd contains a logic error in how it assigns the primary group ID at login, causing a mismatch between a user's UID and GID when the account was created before version 0.5.4 or when the group was manually changed. This results in newly created files and directories being owned by the wrong group, which can deny legitimate access and may grant other local users unintended read or write permissions. The flaw is a local privilege escalation vector that can lead to denial of service or unauthorized access to sensitive data.", "risk_and_exploitability": "The flaw has a CVSS score of 7.3 and no EPSS data is available. It is not listed in CISA\u2019s KEV catalog. Based on the description, the likely attack vector is a local user who triggers an identity provider record update after an existing account has a mismatched UID and GID, or a newly created account before version 0.5.4. Once triggered, an attacker can gain elevated access to files they should not own, leading to data compromise or denial of service. The vulnerability has no publicly known remote exploitation vector."}}}}, "created": "2026-04-28T00:30:15.267771+00:00", "updated": "2026-04-28T04:30:21.141682+00:00", "vendors": ["canonical", "canonical$PRODUCT$authd"]}