CVE-2026-3888

Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.1 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root	Mitigation Third Party Advisory
https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt	Third Party Advisory
https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888	Mitigation Third Party Advisory
https://ubuntu.com/security/CVE-2026-3888	Third Party Advisory
https://ubuntu.com/security/notices/USN-8102-1	Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/18/1	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:22.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:24.04::::lts:::

History

No history.

Information

Published : 2026-03-17 14:16

Updated : 2026-06-17 10:44

NVD link : CVE-2026-3888

Mitre link : CVE-2026-3888

CVE.ORG link : CVE-2026-3888

JSON object : View

Products Affected

canonical

ubuntu_linux

CWE

CWE-268

Privilege Chaining

{"id": "CVE-2026-3888", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3888", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-03-17T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@ubuntu.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 1.1}]}, "affected": [{"source": "security@ubuntu.com", "affectedData": [{"repo": "https://github.com/canonical/snapd/", "versions": [{"status": "affected", "version": "0", "lessThan": "2.75.1", "versionType": "semver"}], "packageName": "snapd", "collectionURL": "https://github.com/canonical", "defaultStatus": "unaffected"}, {"repo": "https://launchpad.net/ubuntu/+source/snapd", "vendor": "Canonical", "product": "Ubuntu 16.04 LTS", "versions": [{"status": "unaffected", "version": "2.61.4ubuntu0.16.04.1+esm2", "lessThan": "*", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "snapd", "collectionURL": "https://launchpad.net/ubuntu/xenial", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/snapd", "vendor": "Canonical", "product": "Ubuntu 18.04 LTS", "versions": [{"status": "unaffected", "version": "2.61.4ubuntu0.18.04.1+esm2", "lessThan": "*", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "snapd", "collectionURL": "https://launchpad.net/ubuntu/bionic", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/snapd", "vendor": "Canonical", "product": "Ubuntu 20.04 LTS", "versions": [{"status": "unaffected", "version": "2.67.1+20.04ubuntu1~esm1", "lessThan": "*", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "snapd", "collectionURL": "https://launchpad.net/ubuntu/focal", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/snapd", "vendor": "Canonical", "product": "Ubuntu 22.04 LTS", "versions": [{"status": "unaffected", "version": "2.73+ubuntu22.04.1", "lessThan": "*", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "snapd", "collectionURL": "https://launchpad.net/ubuntu/jammy", "defaultStatus": "affected"}, {"repo": "https://launchpad.net/ubuntu/+source/snapd", "vendor": "Canonical", "product": "Ubuntu 24.04 LTS", "versions": [{"status": "unaffected", "version": "2.73+ubuntu24.04.2", "lessThan": "*", "versionType": "dpkg"}], "platforms": ["Linux"], "packageName": "snapd", "collectionURL": "https://launchpad.net/ubuntu/noble", "defaultStatus": "affected"}]}], "published": "2026-03-17T14:16:17.410", "references": [{"url": "https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root", "tags": ["Mitigation", "Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt", "tags": ["Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888", "tags": ["Mitigation", "Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://ubuntu.com/security/CVE-2026-3888", "tags": ["Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://ubuntu.com/security/notices/USN-8102-1", "tags": ["Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "http://www.openwall.com/lists/oss-security/2026/03/18/1", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@ubuntu.com", "description": [{"lang": "en", "value": "CWE-268"}]}], "descriptions": [{"lang": "en", "value": "Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. 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."}], "lastModified": "2026-06-17T10:44:23.017", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B"}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D"}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB"}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:22.04:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "359012F1-2C63-415A-88B8-6726A87830DE"}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "BF90B5A4-6E55-4369-B9D4-E7A061E797D2"}], "operator": "OR"}]}], "sourceIdentifier": "security@ubuntu.com"}