Ubuntu — Security Activity Report

Canonical Ubuntu (USN advisories)

Generated Nov 2, 2026Cohort: 9 vendors with ≥10 CVE advisoriesMethodology ↗

CVE Disclosure Volume

Total all-time: 31,349 CVEs with Ubuntu advisories. Source: NVD CVE records joined with vendor advisory publish dates.

1,58920221,36220233,89820243,41420256,1682026

Severity Composition

↓ -14.7 pp

39.2% of Ubuntu's 31,349 CVEs are CRITICAL or HIGH severity. Industry median: 53.8%. Source: NVD CVSS v3.1.

CRITICAL 2,292 (7.3%)HIGH 9,982 (31.8%)MEDIUM 11,384 (36.3%)LOW 615 (2.0%)NONE 6,981 (22.3%)

CISA KEV Listings

↓ -0.3 pp

41 of 13,675 Ubuntu CVEs in the last 3 years are on CISA's Known Exploited Vulnerabilities catalog (0.3%). Industry median: 0.6%.

Source: CISA Known Exploited Vulnerabilities catalog (current snapshot). KEV listing means CISA observed active in-the-wild exploitation.

Vendor Patch Velocity

Insufficient data to publish a reliable patch-velocity metric for Ubuntu(sample size: 0, minimum required: 10).

Top Recurring Weakness Classes

Most-frequently mapped CWEs across Ubuntu's last 3 years of CVE disclosures. Source: NVD — CWE mapping per MITRE taxonomy.

  • CWE-476NULL Pointer Dereference1,439 CVEs
  • CWE-416Use After Free1,291 CVEs
  • CWE-125Out-of-bounds Read782 CVEs
  • CWE-787Out-of-bounds Write686 CVEs
  • CWE-401Missing Release of Memory after Effective Lifetime (Memory Leak)559 CVEs

Recent Security Advisories

Latest advisories published by Ubuntu, straight from the vendor's own feed. Severity labels are the vendor's — scales differ across vendors.

Full advisory archive: /pulse/vendor-advisories →

Data sources & corrections

  • NVD National Vulnerability Database (nvd.nist.gov) — CVE records + CVSS v3.1 severity
  • MITRE cvelistV5 (github.com/CVEProject/cvelistV5) — CNA-published CVE timestamps
  • CISA Known Exploited Vulnerabilities catalog (cisa.gov/known-exploited-vulnerabilities-catalog)
  • Vendor security advisories (Red Hat RHSA, Ubuntu USN, Microsoft MSRC, Cisco PSIRT and other per-vendor feeds; the GitHub and OSV advisory databases are not used) — published_at timestamps
  • MITRE CWE taxonomy (cwe.mitre.org) — weakness class mappings

Snapshot generated Nov 2, 2026: when these counts and industry medians were computed. Vendors in the index are recomputed every 6 hours.

Spot a factual error in this report?

Email support@echelongraph.io with the specific number you're disputing and a link to the authoritative source. We review every report and publish corrections on the methodology page.