RHSA-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
redhat/libreswanto a version that resolves this vulnerability.Fixed in 4.15-11.el9_9 - Upgrade
Upgrade
redhat/libreswan-debuginfoto a version that resolves this vulnerability.Fixed in 4.15-11.el9_9 - Upgrade
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redhat/libreswan-debugsourceto a version that resolves this vulnerability.Fixed in 4.15-11.el9_9 - Upgrade
Upgrade
redhat/libreswanto a version that resolves this vulnerability.Fixed in 4.15-11.el9_9.aa - Upgrade
Upgrade
redhat/libreswan-debuginfoto a version that resolves this vulnerability.Fixed in 4.15-11.el9_9.aa - Upgrade
Upgrade
redhat/libreswan-debugsourceto a version that resolves this vulnerability.Fixed in 4.15-11.el9_9.aa
Event History
Frequently Asked Questions
Which deployments are most directly exposed to the IKEv2 use-after-free issue?
The use-after-free issue is associated with IKEv2 when IKE-over-TCP is in use. Deployments that do not use IKE-over-TCP are not identified in the advisory description as affected by that specific condition.
Can an unauthenticated peer trigger any of these issues?
The EAP-related null pointer dereference is described as occurring before authentication in IKEv2. The advisory does not state the authentication requirements for the IKE-over-TCP use-after-free or the PKCS#7 bundle issue.
What input is associated with the PKCS#7 null pointer dereference?
The PKCS#7 issue is associated with processing a PKCS#7 bundle that contains no CERTS. The advisory does not provide configuration details or a workaround.