libnss-sudo: The sudoedit personality of Sudo before 1.9.5 may allow a localunprivileged user to perform arbitrary directory-exist...
CVE-2021-23239 is fixed in 3 products on 1 platform, first by sudo 1.8.21p2-3ubuntu1.4, released January 26, 2021. It is not reported as exploited. Patch Radar priority: Routine.
The sudoedit personality of Sudo before 1.9.5 may allow a localunprivileged user to perform arbitrary directory-existence tests by winninga sudo_edit.c race condition in replacing a user-controlled directory by asymlink to an arbitrary path.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libnss-sudo · Ubuntu 24.10 (oracular) | 1.9.4p2-2ubuntu2 | libnss-sudo 1.9.4p2-2ubuntu2 | Jan 16, 2026 |
| libnss-sudo · Ubuntu 25.04 (plucky) | 1.9.4p2-2ubuntu2 | libnss-sudo 1.9.4p2-2ubuntu2 | Jan 16, 2026 |
| sudo · RHEL 8 | 0:1.8.29-7.el8 | RHSA-2021:1723 | May 18, 2021 |
| sudo · Ubuntu 18.04.6 LTS (bionic) | 1.8.21p2-3ubuntu1.4 | sudo 1.8.21p2-3ubuntu1.4 | Jan 26, 2021 |
| sudo · Ubuntu 20.04 LTS (focal) | 1.8.31-1ubuntu1.2 | sudo 1.8.31-1ubuntu1.2 | Jan 26, 2021 |
| sudo · Ubuntu 24.10 (oracular) | 1.9.4p2-2ubuntu2 | sudo 1.9.4p2-2ubuntu2 | Jan 16, 2026 |
| sudo · Ubuntu 25.04 (plucky) | 1.9.4p2-2ubuntu2 | sudo 1.9.4p2-2ubuntu2 | Jan 16, 2026 |
| sudo · ol 8 | 0:1.8.29-7.el8 | ELSA-2021-1723 | May 25, 2021 |
| sudo-ldap · Ubuntu 18.04.6 LTS (bionic) | 1.8.21p2-3ubuntu1.4 | sudo-ldap 1.8.21p2-3ubuntu1.4 | Jan 26, 2021 |
| sudo-ldap · Ubuntu 20.04 LTS (focal) | 1.8.31-1ubuntu1.2 | sudo-ldap 1.8.31-1ubuntu1.2 | Jan 26, 2021 |
| sudo-ldap · Ubuntu 24.10 (oracular) | 1.9.4p2-2ubuntu2 | sudo-ldap 1.9.4p2-2ubuntu2 | Jan 16, 2026 |
| sudo-ldap · Ubuntu 25.04 (plucky) | 1.9.4p2-2ubuntu2 | sudo-ldap 1.9.4p2-2ubuntu2 | Jan 16, 2026 |
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