Ubuntu — Security Activity Report

Canonical Ubuntu (USN advisories)

Generated Oct 11, 2026Cohort: 9 vendors with ≥10 CVE advisoriesMethodology ↗

CVE Disclosure Volume

Total all-time: 30,286 CVEs with Ubuntu advisories. Source: NVD CVE records joined with vendor advisory publish dates.

1,57320221,34820233,85320243,35120255,6082026

Severity Composition

↓ -14.2 pp

38.9% of Ubuntu's 30,286 CVEs are CRITICAL or HIGH severity. Industry median: 53.1%. Source: NVD CVSS v3.1.

CRITICAL 2,234 (7.4%)HIGH 9,542 (31.5%)MEDIUM 10,982 (36.3%)LOW 601 (2.0%)NONE 6,748 (22.3%)

CISA KEV Listings

↓ -0.4 pp

39 of 13,087 Ubuntu CVEs in the last 3 years are on CISA's Known Exploited Vulnerabilities catalog (0.3%). Industry median: 0.7%.

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 Dereference1,399 CVEs
  • CWE-416Use After Free1,141 CVEs
  • CWE-125Out-of-bounds Read665 CVEs
  • CWE-787Out-of-bounds Write622 CVEs
  • CWE-401Missing Release of Memory after Effective Lifetime (Memory Leak)526 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 Oct 11, 2026: when these counts and industry medians were computed. Vendors in the index are recomputed every 6 hours.

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