CVE-2026-3888 Affecting snapd package, versions <2.74.1+ubuntu26.04.3
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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Test your applications- Snyk IDSNYK-UBUNTU2610-SNAPD-21227354
- published18 Oct 2026
- disclosed17 Mar 2026
Introduced: 17 Mar 2026
CVE-2026-3888 (opens in a new tab)How to fix?
Upgrade Ubuntu:26.10 snapd to version 2.74.1+ubuntu26.04.3 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 Ubuntu.
See How to fix? for Ubuntu:26.10 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
- http://people.ubuntu.com/~ubuntu-security/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