Bug 2550355

Summary:	CVE-2026-94453 libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP [fedora-all]
Product:	[Fedora] Fedora	Reporter:	TEJ RATHI <trathi>
Component:	libreswan	Assignee:	Paul Wouters <paul.wouters>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	dueno, paul.wouters, shebburn
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---	Flags:	fedora-admin-xmlrpc: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["84813c5f-280a-4d6b-8117-b08d722d588a"]}
Fixed In Version:	libreswan-5.4.1-1.fc43 libreswan-5.4.1-1.fc44 libreswan-5.4.1-4.fc45	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-10-28 02:47:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2550254

Description TEJ RATHI 2026-10-13 11:12:31 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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

Comment 1 Fedora Update System 2026-10-23 14:54:50 UTC

FEDORA-2026-66a7ca796b (libreswan-5.4.1-2.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-66a7ca796b

Comment 2 Fedora Update System 2026-10-23 15:23:12 UTC

FEDORA-2026-fe33d29b75 (libreswan-5.4.1-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-fe33d29b75

Comment 3 Fedora Update System 2026-10-23 15:45:18 UTC

FEDORA-2026-92b72db5d7 (libreswan-5.4.1-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-92b72db5d7

Comment 4 Fedora Update System 2026-10-24 17:25:52 UTC

FEDORA-2026-fe33d29b75 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-fe33d29b75`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-fe33d29b75

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-10-24 17:48:17 UTC

FEDORA-2026-92b72db5d7 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-92b72db5d7`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-92b72db5d7

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-10-24 18:15:52 UTC

FEDORA-2026-66a7ca796b has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-66a7ca796b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-66a7ca796b

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-10-28 02:47:31 UTC

FEDORA-2026-92b72db5d7 (libreswan-5.4.1-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-10-29 01:28:08 UTC

FEDORA-2026-fe33d29b75 (libreswan-5.4.1-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-10-29 02:02:15 UTC

FEDORA-2026-d06ae7ecc2 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-d06ae7ecc2`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d06ae7ecc2

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 10 Fedora Update System 2026-11-01 03:35:40 UTC

FEDORA-2026-d06ae7ecc2 (libreswan-5.4.1-4.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.