CVE-2026-3888

Name	CVE-2026-3888
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6170-1
Debian Bugs	1131120

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
snapd (PTS)	bookworm, bookworm (security)	2.57.6-1+deb12u1	fixed
	trixie (security), trixie	2.68.3-3+deb13u1	fixed
	forky, sid	2.76.3-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
snapd	source	bookworm	2.57.6-1+deb12u1	DSA-6170-1
snapd	source	trixie	2.68.3-3+deb13u1	DSA-6170-1
snapd	source	(unstable)	2.76-1		1131120

Notes

https://www.openwall.com/lists/oss-security/2026/03/17/8
https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt
Fixed by: https://github.com/canonical/snapd/commit/5400bfdf1e4c3f861826a215417234420470cb25 (2.76)