RLSA-2026:97878: Important: libreswan security update
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: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)
libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)
libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
rocky-linux/libreswanto a version that resolves this vulnerability.Fixed in 0:4.15-11.el9_8
Event History
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
Which deployments are most relevant to these fixes?
Systems using Libreswan IKEv2 with IKE-over-TCP are relevant to the use-after-free issue. IKEv2 deployments using EAP, and deployments processing PKCS#7 bundles that contain no CERTS, are relevant to the two null pointer dereference issues.
Does exploitation require an authenticated user or user interaction?
The supplied severity vector identifies network attack access, low attack complexity, no privileges required, and no user interaction. The affected IKEv2 paths include pre-authentication EAP handling.
What is the stated impact?
The advisory rates the update High severity with a 7.5 score and lists availability impact as high. Confidentiality and integrity impacts are listed as none.