Bug 2514433

Summary:	CVE-2026-18321 ntpsec: NTPsec: Denial of Service via buffer overflow in Zyfer refclock [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Todd Cullum <tcullum>
Component:	ntpsec	Assignee:	Miroslav Lichvar <mlichvar>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	45	CC:	geert, igor.raits, mlichvar
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["cbcd7114-4b51-4a21-94bf-8b531d24a82d"]}
Fixed In Version:	ntpsec-1.2.5-1.fc44 ntpsec-1.2.5-1.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-20 15:31:28 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:	2509863

Description Todd Cullum 2026-08-11 22:33:26 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.

Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd

Comment 1 Fedora Update System 2026-08-12 06:18:55 UTC

FEDORA-2026-80887c367d (ntpsec-1.2.5-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-80887c367d

Comment 2 Fedora Update System 2026-08-12 06:19:16 UTC

FEDORA-2026-11d8a5a213 (ntpsec-1.2.5-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-11d8a5a213

Comment 3 Aoife Moloney 2026-08-17 15:52:25 UTC

This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 4 Fedora Update System 2026-08-20 15:31:28 UTC

FEDORA-2026-80887c367d (ntpsec-1.2.5-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 5 Fedora Update System 2026-08-20 15:52:06 UTC

FEDORA-2026-11d8a5a213 (ntpsec-1.2.5-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.