Description
kdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an authenticated user can trigger an authorization-data handling failure. Incorrect data is copied from one ticket to another.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | krb5 +7 | 1.21.1-1.el9 | RHSA-2023:6699 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libkadm5 +6 | 1.21.1-1.el9 | ALSA-2023:6699 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | krb5 | 1.21.1-10.el9_8 | RLSA-2023:6699 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.21.2-1.1 | openSUSE-SU-2024:13527-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libkadm5 +6 | 1.21-3.amzn2023.0.3 | ALAS2023-2023-321 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libkadm5 +6 | 1.21.1-1.0.1.el9 | ELSA-2023-6699 |
Advisories 9
- ALSA-2023:6699 Moderate: krb5 security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:6699 Red Hat Security Advisory: krb5 security and bug fix update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- WID-SEC-2023-2035 MIT Kerberos: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · May 28, 2026
- RLSA-2023:6699 Moderate: krb5 security and bug fix update Rocky Linux Security Advisories · May 28, 2026
- openSUSE-SU-2024:13527-1 krb5-1.21.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1307 Red Hat OpenShift Service Mesh Containers: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 5, 2025
- WID-SEC-2024-0119 Oracle MySQL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ELSA-2023-6699 Moderate: krb5 security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 11, 2023
- ALAS2023-2023-321 Moderate: krb5 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 7, 2023
References
- https://web.mit.edu/kerberos/www/advisories/
- https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
- https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
- https://security.netapp.com/advisory/ntap-20230915-0014/
- https://security.netapp.com/advisory/ntap-20240201-0008/
- https://security.netapp.com/advisory/ntap-20240201-0005/