Bug 2514432

Summary: CVE-2026-18321 ntpsec: NTPsec: Denial of Service via buffer overflow in Zyfer refclock [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Todd Cullum <tcullum>
Component: ntpsecAssignee: Miroslav Lichvar <mlichvar>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: epel10CC: 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: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 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 22:33:19 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