Description
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
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 | 1.18.3-7 | — |
| Debian 13 | krb5 | 1.18.3-7 | — |
| Debian 12 | krb5 | 1.18.3-7 | — |
| Debian 9 | krb5 | 1.15-1+deb9u3 | DLA-2771-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | krb5 | 1.17-6ubuntu4.3 | USN-5959-1 |
| Ubuntu 18.04 LTS | krb5 | 1.16-2ubuntu0.4 | USN-5959-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | krb5 +7 | 1.18.2-8.3.el8_4 | RHSA-2021:3576 |
| RHEL 7 | krb5 +7 | 1.15.1-51.el7_9 | RHSA-2021:4788 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | krb5 | 1.18.2-8.3.el8_4 | RLSA-2021:3576 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | krb5 | 1.16.3-3.24.1 | SUSE-SU-2021:3454-1 |
| SLES 15 SP2 | krb5 | 1.16.3-3.24.1 | SUSE-SU-2021:3454-1 |
| SLES 15 | krb5 | 1.15.2-150000.6.17.1 | SUSE-SU-2022:4154-1 |
| SLES 12 SP5 | krb5 | 1.16.3-46.12.1 | SUSE-SU-2024:1702-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | krb5 | 1.15.2-150000.6.17.1 | SUSE-SU-2022:4154-1 |
| SLES for SAP 12 SP5 | krb5 | 1.16.3-46.12.1 | SUSE-SU-2024:1702-1 |
| SLE Micro 5.1 | krb5 | 1.16.3-3.24.1 | SUSE-SU-2021:3454-2 |
| SLE Micro 5.0 | krb5 | 1.16.3-3.24.1 | SUSE-SU-2021:3454-1 |
| SLE HPC 15 | krb5 | 1.15.2-150000.6.17.1 | SUSE-SU-2022:4154-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.19.2-2.2 | openSUSE-SU-2024:10899-1 |
| openSUSE Leap 15.3 | krb5 | 1.16.3-3.24.1 | openSUSE-SU-2021:3454-1 |
| openSUSE Leap 15.2 | krb5 +1 | 1.16.3-lp152.5.22.1 | openSUSE-SU-2021:1411-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | krb5 | 1.19.3-r0 | — |
| Alpine v3.23 | krb5 | 1.19.3-r0 | — |
| Alpine v3.22 | krb5 | 1.19.3-r0 | — |
| Alpine v3.21 | krb5 | 1.19.3-r0 | — |
| Alpine v3.20 | krb5 | 1.19.3-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | krb5 | 1.19.3-r0 | — |
| Alpine v3.18 | krb5 | 1.19.3-r0 | — |
| Alpine v3.17 | krb5 | 1.19.3-r0 | — |
| Alpine v3.16 | krb5 | 1.19.3-r0 | — |
| Alpine v3.15 | krb5 | 1.19.3-r0 | — |
| Alpine v3.14 | krb5 | 1.18.5-r0 | — |
| Alpine v3.13 | krb5 | 1.18.5-r0 | — |
| Alpine v3.12 | krb5 | 1.18.5-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libkadm5 +6 | 1.15.1-37.amzn2.2.4 | ALAS2-2022-1738 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | krb5 | 1.19.3-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | libkadm5 +6 | 1.18.2-8.3.el8_4 | ELSA-2021-3576 |
| Oracle Linux 7 | libkadm5 +6 | 1.15.1-51.0.1.el7_9 | ELSA-2021-4788 |
Advisories 22
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- RHSA-2021:4788 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2021:3576 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- USN-5959-1 krb5 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-2771-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:3576 Moderate: krb5 security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2021:3454-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1411-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3454-2 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3454-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10899-1 krb5-1.19.2-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1424 Xerox FreeFlow Print Server für Solaris: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- WID-SEC-2025-0225 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- SUSE-SU-2022:4154-1 Security update for krb5 SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2024:1702-1 Security update for krb5 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-0678 MIT Kerberos: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 2, 2024
- WID-SEC-2023-0561 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 18, 2023
- WID-SEC-2022-0676 Juniper Junos Space: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 11, 2023
- ALAS2-2022-1738 Moderate: krb5 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 20, 2022
- ELSA-2021-4788 Moderate: krb5 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 24, 2021
- ELSA-2021-3576 Moderate: krb5 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 23, 2021
References
- https://web.mit.edu/kerberos/advisories/
- https://github.com/krb5/krb5/releases
- FEDORA-2021-f2c8514f02 vendor-advisory
- [debian-lts-announce] 20210930 [SECURITY] [DLA 2771-1] krb5 security update mailing-list
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49
- https://security.netapp.com/advisory/ntap-20210923-0002/
- https://www.starwindsoftware.com/security/sw-20220817-0004/