CVE-2026-3888

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This issue affects Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS."}, {"lang": "es", "value": "La escalada de privilegios local en snapd en Linux permite a los atacantes locales obtener privilegios de root al recrear el directorio /tmp privado de snap cuando systemd-tmpfiles est\u00e1 configurado para limpiar autom\u00e1ticamente este directorio. Este problema afecta a Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS y 24.04 LTS."}], "id": "CVE-2026-3888", "lastModified": "2026-06-17T10:44:23.017", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.1, "impactScore": 6.0, "source": "security@ubuntu.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3888", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-17T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-03-17T14:16:17.410", "references": [{"source": "security@ubuntu.com", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root"}, {"source": "security@ubuntu.com", "tags": ["Third Party Advisory"], "url": "https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt"}, {"source": "security@ubuntu.com", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888"}, {"source": "security@ubuntu.com", "tags": ["Third Party Advisory"], "url": "https://ubuntu.com/security/CVE-2026-3888"}, {"source": "security@ubuntu.com", "tags": ["Third Party Advisory"], "url": "https://ubuntu.com/security/notices/USN-8102-1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/03/18/1"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-268"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[*,2.61.4ubuntu0.16.04.1+esm2)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[*,2.61.4ubuntu0.18.04.1+esm2)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[*2.67.1+20.04ubuntu1~esm1)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[*,2.73+ubuntu22.04.1)"}}, {"platform": ["linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[*,2.73+ubuntu24.04.1)"}}], "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"}], "analysis": {"en": {"generated_at": "2026-03-17T16:46:18.513381+00:00", "value": {"mitigation_remediation": ["Install the latest snapd update from Canonical\u2019s official repositories to apply any vendor\u2010supplied fix", "Verify and, if necessary, modify systemd-tmpfiles rules so that the /tmp directory used by snapd is not automatically deleted or recreated", "Monitor system logs for unusual activity indicating attempted privilege escalation or unauthorized subscription access"], "summary": {"action": "Immediate Patch", "impact": "Local Privilege Escalation"}, "threat_synthesis": {"affected_systems": "Affected versions include Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS as provided by the vendor. No finer-grained version details are supplied in the CVE data, so all releases of snapd running under Canonical\u2019s Ubuntu distributions are potentially impacted.", "description_and_impact": "The vulnerability in snapd on Linux allows a local attacker to obtain root privileges by exploiting the way the service recreates snap's private /tmp directory when systemd-tmpfiles reclaims system temporary files. This flaw, identified as CWE-268 (Missing Authorization Functionality), enables an unauthenticated local user to gain full administrative control over the affected system, compromising confidentiality, integrity, and availability at the host level.", "risk_and_exploitability": "The CVSS score of 7.8 indicates a high severity. The EPSS score is not available, and the vulnerability is not listed in CISA\u2019s KEV catalog. Because the attack requires local system access, a user who can execute code on the machine may trigger the re-creation of the private /tmp directory and elevate privileges. No mention of network-based exploitation or remote resources is made in the description, so the vector is inferred to be local only."}}}}, "created": "2026-03-18T12:13:23.156382+00:00", "updated": "2026-03-24T10:49:18.151475+00:00", "vendors": ["canonical", "canonical$PRODUCT$ubuntu"]}