Description
In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can modify the plaintext Extra Count field of a confidential GSS krb5 wrap token, causing the unwrapped token to appear truncated to the application.
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+deb12u2 | DSA-5726-1 |
| Debian 11 | krb5 | 1.18.3-6+deb11u5 | DSA-5726-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | krb5 | 1.20.1-6ubuntu2.1 | USN-6947-1 |
| Ubuntu 22.04 LTS | krb5 | 1.19.2-2ubuntu0.4 | USN-6947-1 |
| Ubuntu 20.04 LTS | krb5 | 1.17-6ubuntu4.6 | USN-6947-1 |
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+esm2 | USN-6947-1 |
| Ubuntu Pro 16.04 LTS | krb5 | 1.13.2+dfsg-5ubuntu2.2+esm5 | USN-6947-1 |
| Ubuntu Pro 14.04 LTS | krb5 | 1.12+dfsg-2ubuntu5.4+esm5 | USN-6947-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | krb5 +7 | 1.21.1-2.el9_4 | RHSA-2024:6166 |
| RHEL 8 | krb5 +7 | 1.18.2-29.el8_10 | RHSA-2024:5312 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | krb5 +7 | 1.20.1-9.el9_2.1 | RHSA-2024:5643 |
| RHEL 9.0 E4S | krb5 +7 | 1.19.1-16.el9_0.1 | RHSA-2024:5630 |
| RHEL 8.8 EUS | krb5 +7 | 1.18.2-26.el8_8.2 | RHSA-2024:4743 |
| RHEL 8.6 TUS | krb5 +7 | 1.18.2-16.el8_6.1 | RHSA-2024:5625 |
| RHEL 8.6 E4S | krb5 +7 | 1.18.2-16.el8_6.1 | RHSA-2024:5625 |
| RHEL 8.6 AUS | krb5 +7 | 1.18.2-16.el8_6.1 | RHSA-2024:5625 |
| RHEL 8.4 TUS | krb5 +7 | 1.18.2-9.el8_4.1 | RHSA-2024:4734 |
| RHEL 8.4 E4S | krb5 +7 | 1.18.2-9.el8_4.1 | RHSA-2024:4734 |
| RHEL 8.4 AUS | krb5 +7 | 1.18.2-9.el8_4.1 | RHSA-2024:4734 |
| RHEL 8.2 AUS | krb5 +7 | 1.17-19.el8_2.1 | RHSA-2024:5884 |
| RHEL 7.7 AUS | krb5 +7 | 1.15.1-37.el7_7.4 | RHSA-2024:5316 |
| RHEL 7 ELS | krb5 +7 | 1.15.1-55.el7_9.2 | RHSA-2024:5076 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libkadm5 +6 | 1.21.1-2.el9_4 | ALSA-2024:6166 |
| AlmaLinux 8 | libkadm5 +6 | 1.18.2-29.el8_10 | ALSA-2024:5312 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | krb5 | 1.18.2-29.el8_10 | RLSA-2024:5312 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | krb5 | 1.20.1-150600.11.3.1 | SUSE-SU-2024:2307-1 |
| SLES 15 SP5 | krb5 | 1.20.1-150500.3.9.1 | SUSE-SU-2024:2302-1 |
| SLES 15 SP4 | krb5 | 1.19.2-150400.3.12.1 | SUSE-SU-2024:2322-1 |
| SLES 15 SP3 | krb5 | 1.19.2-150300.19.1 | SUSE-SU-2024:2303-1 |
| SLES 15 SP2 | krb5 | 1.16.3-150100.3.36.1 | SUSE-SU-2024:2305-1 |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | krb5 | 1.16.3-46.15.1 | SUSE-SU-2024:2300-1 |
| SLES for SAP 15 SP4 | krb5 | 1.19.2-150400.3.12.1 | SUSE-SU-2024:2322-1 |
| SLES for SAP 15 SP3 | krb5 | 1.19.2-150300.19.1 | SUSE-SU-2024:2303-1 |
| SLES for SAP 15 SP2 | krb5 | 1.16.3-150100.3.36.1 | SUSE-SU-2024:2305-1 |
| SLES for SAP 12 SP5 | krb5 | 1.16.3-46.15.1 | SUSE-SU-2024:2300-1 |
| SLE Micro 6.0 | krb5 | 1.20.1-5.1 | SUSE-SU-2025:20051-1 |
| SLE Micro 5.5 | krb5 | 1.20.1-150500.3.9.1 | SUSE-SU-2024:2302-1 |
| SLE Micro 5.4 | krb5 | 1.19.2-150400.3.12.1 | SUSE-SU-2024:2322-1 |
| SLE Micro 5.3 | krb5 | 1.19.2-150400.3.12.1 | SUSE-SU-2024:2322-1 |
| SLE Micro 5.2 | krb5 | 1.19.2-150300.19.1 | SUSE-SU-2024:2303-1 |
| SLE Micro 5.1 | krb5 | 1.19.2-150300.19.1 | SUSE-SU-2024:2303-1 |
| SLE HPC 15 SP4 | krb5 | 1.19.2-150400.3.12.1 | SUSE-SU-2024:2322-1 |
| SLE HPC 15 SP3 | krb5 | 1.19.2-150300.19.1 | SUSE-SU-2024:2303-1 |
| SLE HPC 15 SP2 | krb5 | 1.16.3-150100.3.36.1 | SUSE-SU-2024:2305-1 |
| SUSE Manager Server 4.3 | krb5 | 1.19.2-150400.3.12.1 | SUSE-SU-2024:2322-1 |
| SUSE Manager Proxy 4.3 | krb5 | 1.19.2-150400.3.12.1 | SUSE-SU-2024:2322-1 |
| SUSE Enterprise Storage 7.1 | krb5 | 1.19.2-150300.19.1 | SUSE-SU-2024:2303-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.21.3-1.1 | openSUSE-SU-2024:14111-1 |
| openSUSE Leap 15.6 | krb5 | 1.20.1-150600.11.3.1 | SUSE-SU-2024:2307-1 |
| openSUSE Leap 15.5 | krb5 | 1.20.1-150500.3.9.1 | SUSE-SU-2024:2302-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | krb5 | 1.20.3-r0 | — |
| Alpine v3.23 | krb5 | 1.20.3-r0 | — |
| Alpine v3.22 | krb5 | 1.20.3-r0 | — |
| Alpine v3.21 | krb5 | 1.20.3-r0 | — |
| Alpine v3.20 | krb5 | 1.20.3-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | krb5 | 1.20.3-r0 | — |
| Alpine v3.18 | krb5 | 1.20.2-r1 | — |
| Alpine v3.17 | krb5 | 1.20.2-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libkadm5 +6 | 1.21.3-1.amzn2023.0.1 | ALAS2023-2024-688 |
| Amazon Linux 2 | libkadm5 +6 | 1.15.1-55.amzn2.2.8 | ALAS2-2024-2595 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | krb5 | 1.21.3-1 | — |
| Azure Linux 2 (CBL-Mariner) | krb5 | 1.19.4-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libkadm5 +6 | 1.21.1-2.0.1.el9_4 | ELSA-2024-6166 |
| Oracle Linux 8 | libkadm5 +6 | 1.18.2-29.0.1.el8_10 | ELSA-2024-5312 |
| Oracle Linux 7 | libkadm5 +6 | 1.15.1-55.0.3.el7_9 | ELSA-2024-5076 |
Advisories 41
- ALSA-2024:6166 Moderate: krb5 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:5312 Moderate: krb5 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:6166 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5884 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5643 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5630 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5625 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5316 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5312 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5076 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:4743 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:4734 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-0001 IBM DB2: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- USN-6947-1 krb5 vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- SUSE-SU-2025:20051-1 Security update for krb5 SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5726-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2024-1913 Red Hat OpenShift Container Platform: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 3, 2026
- WID-SEC-2024-1467 MIT Kerberos: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Feb 15, 2026
- SUSE-SU-2024:2307-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2302-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2303-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2300-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14111-1 krb5-1.21.3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2305-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0225 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2025
- NCSC-2025-0187 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jun 10, 2025
- RLSA-2024:5312 Moderate: krb5 security update Rocky Linux Security Advisories · May 7, 2025
- SUSE-SU-2024:2322-1 Security update for krb5 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2025-0612 IBM Security Guardium: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 20, 2025
- NCSC-2025-0027 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0024 Kwetsbaarheden verholpen in Oracle MySQL NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2025-0021 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Jan 22, 2025
- NCSC-2024-0411 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Oct 17, 2024
- ELSA-2024-5076 Moderate: krb5 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 30, 2024
- ELSA-2024-6166 Moderate: krb5 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 3, 2024
- NCSC-2024-0339 Kwetsbaarheden verholpen in Microsoft Mariner NCSC-NL (Netherlands) · Aug 13, 2024
- ELSA-2024-5312 Moderate: krb5 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 13, 2024
- ALAS2023-2024-688 Moderate: krb5 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 6, 2024
- ALAS2-2024-2595 Moderate: krb5 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 22, 2024