What is CVE-2026-3351?

CVE-2026-3351 is a medium-severity vulnerability in Linux Kernel, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-03-03.

How severe is CVE-2026-3351?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Linux Kernel

CVE-2026-3351

Improper authorization in the API endpoint GET /1.0/certificates in Canonical LXD 6.6 on Linux allows an authenticated, restricted user to enumerate all certificate fingerprints trusted by the lxd server.

Vulnerability class: Broken Access Control

Published 2026-03-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (10.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001

Affected products

Linux Kernel
Canonical Lxd — versions 6.6

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

github.com/canonical/lxd/security/advisories/GHSA-crmg-9m86-636r (Exploit, vendor-advisory, Mitigation, vdb-entry, Vendor Advisory)
github.com/canonical/lxd/pull/17738 (issue-tracking, Patch, patch, Issue Tracking)
github.com/canonical/lxd/commit/d936c90d47cf0be1e9757df897f769e9887ebde1 (Patch, patch)

Frequently asked questions

What is CVE-2026-3351?: CVE-2026-3351 is a medium-severity vulnerability in Linux Kernel, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-03-03.
How severe is CVE-2026-3351?: Medium severity. CVSS v3 base score is 4.3 out of 10.