Bug 2550254 (CVE-2026-94453) - CVE-2026-94453 libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP
Summary: CVE-2026-94453 libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP
Keywords:
Status: NEW
Alias: CVE-2026-94453
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2550355
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-13 07:50 UTC by OSIDB Bzimport
Modified: 2026-10-13 11:12 UTC (History)
22 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-10-13 07:50:19 UTC 
IKE state is retained in memory after the client closes the connection storing a pointer to iface_endpoint inside ike_sa.sa->st_iface_endpoint. Once this invalid pointer is used, the daemon crashes. This can happen before the remote peer has authenticated itself. The option for IKE over TCP is not enabled by default. Only configurations that contain listen-tcp=yes are affected. Continued triggering of this vulnerability can lead to a denial of service. Remote code execution could be possible.

Vulnerable versions : 4.0 up to and including 5.4
Not vulnerable      : 5.4.1 and 5.3.3
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