CVE-2026-3888 Affecting snapd package, versions <2.57.6-1+deb12u1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Jul 2026
- disclosed17 Mar 2026
Introduced: 17 Mar 2026
CVE-2026-3888 (opens in a new tab)How to fix?
Upgrade Echo:latest snapd to version 2.57.6-1+deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream snapd package and not the snapd package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2026-3888
- https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root
- https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt
- https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888
- https://ubuntu.com/security/CVE-2026-3888
- https://ubuntu.com/security/notices/USN-8102-1
- http://www.openwall.com/lists/oss-security/2026/03/18/1
- https://github.com/TheCyberGeek/CVE-2026-3888-snap-confine-systemd-tmpfiles-LPE