Description
lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) before 1.20.2 and 1.21.x before 1.21.1 frees an uninitialized pointer. A remote authenticated user can trigger a kadmind crash. This occurs because _xdr_kadm5_principal_ent_rec does not validate the relationship between n_key_data and the key_data array count.
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 | 1.20.1-3 | — |
| Debian 13 | krb5 | 1.20.1-3 | — |
| Debian 12 | krb5 | 1.20.1-2+deb12u1 | — |
| Debian 10 | krb5 | 1.17-3+deb10u6 | DLA-3626-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | krb5 | 1.19.2-2ubuntu0.3 | USN-6467-2 |
| Ubuntu 20.04 LTS | krb5 | 1.17-6ubuntu4.4 | USN-6467-2 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | krb5 | 1.16-2ubuntu0.4+esm1 | USN-6467-1 |
| Ubuntu Pro 16.04 LTS | krb5 | 1.13.2+dfsg-5ubuntu2.2+esm4 | USN-6467-1 |
| Ubuntu Pro 14.04 LTS | krb5 | 1.12+dfsg-2ubuntu5.4+esm4 | USN-6467-1 |
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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | krb5 | 1.20.1-150500.3.3.1 | SUSE-SU-2023:3325-1 |
| SLES 15 SP4 | krb5 | 1.19.2-150400.3.6.1 | SUSE-SU-2023:3363-1 |
| SLES 15 SP3 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
| SLES 15 SP2 | krb5 | 1.16.3-150100.3.30.1 | SUSE-SU-2023:3434-1 |
| SLES 15 SP1 | krb5 | 1.16.3-150100.3.30.1 | SUSE-SU-2023:3434-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | krb5 | 1.12.5-40.52.1 | SUSE-SU-2023:3398-1 |
| SLES 12 SP2 | krb5 | 1.12.5-40.52.1 | SUSE-SU-2023:3398-1 |
| SLES for SAP 15 SP3 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
| SLES for SAP 15 SP2 | krb5 | 1.16.3-150100.3.30.1 | SUSE-SU-2023:3434-1 |
| SLES for SAP 15 SP1 | krb5 | 1.16.3-150100.3.30.1 | SUSE-SU-2023:3434-1 |
| SLES for SAP 12 SP5 | krb5 | 1.12.5-40.52.1 | SUSE-SU-2023:3398-1 |
| SLE Micro 5.4 | krb5 | 1.19.2-150400.3.6.1 | SUSE-SU-2023:3363-1 |
| SLE Micro 5.3 | krb5 | 1.19.2-150400.3.6.1 | SUSE-SU-2023:3363-1 |
| SLE Micro 5.2 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
| SLE Micro 5.1 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
| SLE HPC 15 SP3 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
| SLE HPC 15 SP2 | krb5 | 1.16.3-150100.3.30.1 | SUSE-SU-2023:3434-1 |
| SLE HPC 15 SP1 | krb5 | 1.16.3-150100.3.30.1 | SUSE-SU-2023:3434-1 |
| SUSE Manager Server 4.2 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
| SUSE Manager Proxy 4.2 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
| SUSE Enterprise Storage 7.1 | krb5 | 1.19.2-150300.13.1 | SUSE-SU-2023:3365-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.21.1-1.1 | openSUSE-SU-2024:13050-1 |
| openSUSE Leap 15.5 | krb5 | 1.20.1-150500.3.3.1 | SUSE-SU-2023:3325-1 |
| openSUSE Leap 15.4 | krb5 | 1.19.2-150400.3.6.1 | SUSE-SU-2023:3363-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | krb5 | 1.19.2-150400.3.6.1 | SUSE-SU-2023:3363-1 |
| openSUSE Leap Micro 5.3 | krb5 | 1.19.2-150400.3.6.1 | SUSE-SU-2023:3363-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | krb5 | 1.20.2-r0 | — |
| Alpine v3.17 | krb5 | 1.20.2-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libkadm5 +6 | 1.21-3.amzn2023.0.3 | ALAS2023-2023-321 |
| Amazon Linux 2 | libkadm5 +6 | 1.15.1-55.amzn2.2.6 | ALAS2-2023-2225 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | krb5 | 1.19.4-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libkadm5 +6 | 1.21.1-1.0.1.el9 | ELSA-2023-6699 |
Advisories 19
- 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
- USN-6467-1 krb5 vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- WID-SEC-2023-1973 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
- USN-6467-2 krb5 vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3626-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2023:3398-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3363-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13050-1 krb5-1.21.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3325-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3434-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3365-1 Security update for krb5 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-1307 Red Hat OpenShift Service Mesh Containers: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 5, 2025
- SSA-806742 SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4 Siemens ProductCERT · Feb 13, 2024
- ICSA-24-046-11 Siemens SCALANCE XCM-/XRM-300 CISA ICS & IT advisories · Feb 13, 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
- ALAS2-2023-2225 Moderate: krb5 security update (Amazon Linux 2) 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-final...krb5-1.21.1-final
- https://github.com/krb5/krb5/compare/krb5-1.20.1-final...krb5-1.20.2-final
- https://github.com/krb5/krb5/commit/ef08b09c9459551aabbe7924fb176f1583053cdd
- https://security.netapp.com/advisory/ntap-20230908-0004/
- [debian-lts-announce] 20231022 [SECURITY] [DLA 3626-1] krb5 security update mailing-list