How severe is CVE-2026-3888?

CVE-2026-3888 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3888 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3888?

CVE-2026-3888 primarily affects Canonical Ubuntu Linux. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-3888?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3888 have an EU (EUVD) identifier?

Yes. CVE-2026-3888 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12570.

When was CVE-2026-3888 published?

CVE-2026-3888 was published on 2026-03-17 and last updated on 2026-06-17.

CVE-2026-3888

CVE-2026-3888 is a high-severity vulnerability in Canonical Ubuntu Linux with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-268.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12570
Weakness: CWE-268
Affected product: Canonical Ubuntu Linux
Published: 2026-03-17
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3888?: CVE-2026-3888 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3888 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3888?: CVE-2026-3888 primarily affects Canonical Ubuntu Linux. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-3888?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3888 have an EU (EUVD) identifier?: Yes. CVE-2026-3888 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12570.
When was CVE-2026-3888 published?: CVE-2026-3888 was published on 2026-03-17 and last updated on 2026-06-17.

References

Affected products (5)

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:*:*:*

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