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ALSA-2023:2633 — Moderate: libreswan security update

2026-10-02T19:39:48.461411+00:00

Affected: AlmaLinux:9: libreswan

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

* libreswan: remote DoS via crafted TS payload with an incorrect selector length (CVE-2023-23009)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

EUVD-2026-223057

2026-10-02T19:39:48.461470+00:00

EUVD-2026-223057

fkie_cve-2023-23009

2026-10-02T19:39:48.461486+00:00

Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length.

GHSA-3gxg-hfhr-6g9x

2026-10-02T19:39:48.461507+00:00

Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length.

gsd-2023-23009

2026-10-02T19:39:48.461529+00:00

gsd-2023-23009

OESA-2023-1150 — libreswan security update

2026-10-02T19:39:48.461540+00:00

Affected: openEuler:22.03-LTS: libreswan

Libreswan is an implementation of IKEv1 and IKEv2 for IPsec. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks. Everything passing through the untrusted net is encrypted by the ipsec gateway machine and decrypted by the gateway at the other end of the tunnel. The resulting tunnel is a virtual private network or VPN. This package contains the daemons and userland tools for setting up Libreswan. Libreswan also supports IKEv2 (RFC7296) and Secure Labeling Libreswan is based on Openswan-2.6.38 which in turn is based on FreeS/WAN-2.04 Security Fix(es): Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length.(CVE-2023-23009)

RHBA-2024:11505 — Red Hat Bug Fix Advisory: OpenShift Container Platform 4.16.28 packages and security update

2026-10-02T19:39:48.461563+00:00

libreswan: Regression of CVE-2023-30570 fixes in the Red Hat Enterprise Linux libreswan: remote DoS via crafted TS payload with an incorrect selector length libreswan: Malicious IKEv1 Aggressive Mode packets can crash libreswan libreswan: Invalid IKEv2 REKEY proposal causes restart libreswan: Invalid IKEv1 Quick Mode ID causes restart libreswan: Invalid IKEv1 repeat IKE SA delete causes crash and restart libreswan: Missing PreSharedKey for connection can cause crash libreswan: IKEv1 default AH/ESP responder can crash and restart

RHSA-2023:2633 — Red Hat Security Advisory: libreswan security update

2026-10-02T19:39:48.461588+00:00

libreswan: remote DoS via crafted TS payload with an incorrect selector length

UBUNTU-CVE-2023-23009

2026-10-02T19:39:48.461602+00:00

Affected: Ubuntu:18.04:LTS: libreswan, Ubuntu:20.04:LTS: libreswan, Ubuntu:22.04:LTS: libreswan, Ubuntu:24.04:LTS: libreswan, Ubuntu:25.10: libreswan, Ubuntu:26.04:LTS: libreswan

Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length.

WID-SEC-W-2023-1185 — Red Hat Enterprise Linux: Mehrere Schwachstellen

2026-10-02T19:39:48.461625+00:00

Ein Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand auszulösen, seine Privilegien zu erweitern und Daten zu manipulieren.