Description
Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/kdc/ndr.c.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | krb5 | 1.21.3-1 | — |
| Debian 13 | krb5 | 1.21.3-1 | — |
| Debian 12 | krb5 | 1.20.1-2+deb12u3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | krb5 | 1.20.1-6ubuntu2.5 | USN-7314-1 |
| Ubuntu 22.04 LTS | krb5 | 1.19.2-2ubuntu0.6 | USN-7314-1 |
| Ubuntu 20.04 LTS | krb5 | 1.17-6ubuntu4.9 | USN-7314-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | krb5 +7 | 1.21.1-3.el9 | RHSA-2024:9331 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libkadm5 +6 | 1.21.1-3.el9 | ALSA-2024:9331 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | krb5 | 1.20.1-150500.3.6.1 | SUSE-SU-2024:0997-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.0 | krb5 | 1.20.1-5.1 | SUSE-SU-2025:20051-1 |
| SLE Micro 5.5 | krb5 | 1.20.1-150500.3.6.1 | SUSE-SU-2024:0997-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.21.2-3.1 | openSUSE-SU-2024:13921-1 |
| openSUSE Leap 15.5 | krb5 | 1.20.1-150500.3.6.1 | SUSE-SU-2024:0997-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libkadm5 +6 | 1.21-3.amzn2023.0.4 | ALAS2023-2024-586 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | krb5 | 1.21.3-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libkadm5 +6 | 1.21.1-3.0.1.el9 | ELSA-2024-9331 |
Advisories 10
- ALSA-2024:9331 Moderate: krb5 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:9331 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Aug 13, 2026
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- WID-SEC-2024-0485 MIT Kerberos: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jul 7, 2026
- USN-7314-1 krb5 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:20051-1 Security update for krb5 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2024:13921-1 krb5-1.21.2-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0997-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2024-9331 Moderate: krb5 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 14, 2024
- ALAS2023-2024-586 Moderate: krb5 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 15, 2024