CVE-2026-3888 is a high-severity local privilege escalation vulnerability in snapd, impacting Ubuntu LTS versions from 16.04 to 24.04. With a CVSS score of 7.8 (High), it allows a local attacker with low privileges to achieve root access by exploiting a race condition during systemd-tmpfiles cleanup of snap's private /tmp directory. Despite its high attack complexity, the potential impact includes full system compromise. Although not listed in CISA KEV, this vulnerability is on the "Hot List: Active" and has received significant community and media attention, with reports of its use in a HackTheBox challenge, suggesting practical exploitability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
16.04CPE matchmatch criteria | cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | ||
18.04CPE matchmatch criteria | cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | ||
20.04CPE matchmatch criteria | cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* | ||
22.04CPE matchmatch criteria | cpe:2.3:o:canonical:ubuntu_linux:22.04:*:*:*:lts:*:*:* | ||
24.04CPE matchmatch criteria | cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.4 InfoSec Media, 0.1 Vendor Blog, and 0.0 Security Researcher mentions.