RLSA-2026:98088: 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/libreswan-minimalto a version that resolves this vulnerability.Fixed in 0:5.4.1-1.el10_3 - Upgrade
Upgrade
rocky-linux/libreswan-debugsourceto a version that resolves this vulnerability.Fixed in 0:5.4.1-1.el10_3 - Upgrade
Upgrade
rocky-linux/libreswan-minimal-debuginfoto a version that resolves this vulnerability.Fixed in 0:5.4.1-1.el10_3 - Upgrade
Upgrade
rocky-linux/libreswanto a version that resolves this vulnerability.Fixed in 0:5.4.1-1.el10_3
Event History
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
Which deployments are most exposed to the IKE-over-TCP issue?
Deployments using Libreswan IKEv2 with IKE-over-TCP are implicated by CVE-2026-94453. The provided information does not establish whether IKE-over-TCP is enabled by default.
Does exploiting these issues require authentication or user interaction?
The advisory’s CVSS vector indicates network access, low attack complexity, no privileges required, and no user interaction. One of the listed flaws is specifically described as occurring before authentication in IKEv2 EAP code.
What is the stated impact of the vulnerabilities?
The CVSS vector reports no confidentiality or integrity impact and a high availability impact. The listed defect classes include a use-after-free and null pointer dereferences, consistent with service-disruption risk.
Which Rocky Linux packages are covered by this update?
The advisory lists libreswan, libreswan-minimal, libreswan-debugsource, and libreswan-minimal-debuginfo.