Ubuntu 21.x — End of Life
EOL Actively exploitedUbuntu 21.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 21.10 | Oct 14, 2021 | Jul 14, 2022 | Jul 14, 2022 | 21.10 | EOL |
| 21.04 | Apr 22, 2021 | Jan 20, 2022 | Jan 20, 2022 | 21.04 | EOL |
CVEs affecting Ubuntu 21.x (2)
| CVE | Severity | CVSS | EPSS | KEV | Cycle | Description | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-31431 | HIGH | 7.8 | 96.27% | KEV | 21.10 | In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-pla… | Apr 22, 2026 |
| CVE-2026-31431 | HIGH | 7.8 | 96.27% | KEV | 21.04 | In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-pla… | Apr 22, 2026 |
Ubuntu 21.x is EOL — migrate to Ubuntu 22.x
Ubuntu 22.x is the next major release. Plan your upgrade before Ubuntu 21.x stops receiving security patches.
Frequently asked questions
Is Ubuntu 21 end of life?
Yes. All Ubuntu 21.x releases have reached end of life and no longer receive security patches. There are 2 known CVEs affecting Ubuntu 21.x. Migrate to Ubuntu 22.x as soon as possible.
What CVEs affect Ubuntu 21?
There are 2 CVEs tracked for Ubuntu 21.x and 2 listed in the CISA Known Exploited Vulnerabilities catalog. See the full list above with CVSS and EPSS scores.
What is the latest Ubuntu 21 version?
The latest Ubuntu 21.x patch release is 21.10, released on October 14, 2021. Always run the latest patch to benefit from all security fixes.
How to migrate from Ubuntu 21 to Ubuntu 22?
To migrate from Ubuntu 21 to Ubuntu 22: (1) review the official Ubuntu 22 migration guide for breaking changes, (2) update dependencies and configuration accordingly, (3) test thoroughly in a staging environment, (4) deploy with a rollback plan. Starting early gives you time to resolve compatibility issues before your current version reaches end of life.
Is it safe to run Ubuntu 21 in production?
No. Ubuntu 21 has reached end of life and security vulnerabilities are no longer patched. Critically, 2 CVEs affecting Ubuntu 21.x are in the CISA KEV catalog — meaning they are actively exploited in the wild. Upgrade to a supported version immediately.
Data sourced from endoflife.date · CVE data from NVD · EPSS from FIRST.org · KEV from CISA