Description
An issue was discovered in Libreswan before 4.12. When an IKEv1 Quick Mode connection configured with ID_IPV4_ADDR or ID_IPV6_ADDR receives an IDcr payload with ID_FQDN, a NULL pointer dereference causes a crash and restart of the pluto daemon. NOTE: the earliest affected version is 4.6.
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 13 | libreswan | 4.12-1 | — |
| Debian 12 | libreswan | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libreswan | No fix yet | — |
| Ubuntu 26.04 LTS | libreswan | No fix yet | — |
| Ubuntu 25.10 | libreswan | No fix yet | — |
| Ubuntu 24.04 LTS | libreswan | No fix yet | — |
| Ubuntu 22.04 LTS | libreswan | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libreswan | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | libreswan | 4.12-1.el9 | RHSA-2023:6549 |
| RHEL 8 | libreswan | 4.12-2.el8 | RHSA-2023:7052 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | libreswan | 4.9-5.el9_2.4 | RHSA-2025:0309 |
| RHEL 9.0 E4S | libreswan | 4.6-3.el9_0.3 | RHSA-2024:10594 |
| Red Hat OpenShift 4 | libreswan | 4.6-3.el9_0.3 | RHBA-2024:11565, RHBA-2024:11525, RHBA-2024:11505 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libreswan | 4.12-1.el9 | ALSA-2023:6549 |
| AlmaLinux 8 | libreswan | 4.12-2.el8 | ALSA-2023:7052 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | libreswan | 4.12-2.el8_10.3 | RLSA-2023:7052 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libreswan | 4.12-r0 | — |
| Alpine v3.23 | libreswan | 4.12-r0 | — |
| Alpine v3.22 | libreswan | 4.12-r0 | — |
| Alpine v3.21 | libreswan | 4.12-r0 | — |
| Alpine v3.20 | libreswan | 4.12-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libreswan | 4.12-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libreswan | 4.7-6 | — |
| Azure Linux 2 (CBL-Mariner) | libreswan | 4.7-5 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libreswan | 4.12-1.0.1.el9 | ELSA-2023-6549 |
| Oracle Linux 8 | libreswan | 4.12-2.0.1.el8 | ELSA-2023-7052 |
Advisories 13
- WID-SEC-2023-2853 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ALSA-2023:6549 Moderate: libreswan security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:7052 Moderate: libreswan security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:0309 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2024:10594 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2023:7052 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2023:6549 Red Hat Security Advisory: libreswan security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RLSA-2023:7052 Moderate: libreswan security update Rocky Linux Security Advisories · May 21, 2026
- RHBA-2024:11505 Red Hat Bug Fix Advisory: OpenShift Container Platform 4.16.28 packages and security update Red Hat Security Advisories (RHSA) · Jan 29, 2026
- RHBA-2024:11565 Red Hat Bug Fix Advisory: OpenShift Container Platform 4.15.42 packages update Red Hat Security Advisories (RHSA) · Jan 29, 2026
- RHBA-2024:11525 Red Hat Bug Fix Advisory: OpenShift Container Platform 4.17.10 packages and security update Red Hat Security Advisories (RHSA) · Jan 29, 2026
- ELSA-2023-7052 Moderate: libreswan security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 17, 2023
- ELSA-2023-6549 Moderate: libreswan security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 11, 2023