Bug 2514433 - CVE-2026-18321 ntpsec: NTPsec: Denial of Service via buffer overflow in Zyfer refclock [fedora-all]
Summary: CVE-2026-18321 ntpsec: NTPsec: Denial of Service via buffer overflow in Zyfer...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: ntpsec
Version: 45
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: ---
Assignee: Miroslav Lichvar
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["cbcd7114-4b51-4a21-94bf-8...
Depends On:
Blocks: CVE-2026-18321
TreeView+ depends on / blocked
 
Reported: 2026-08-11 22:33 UTC by Todd Cullum
Modified: 2026-08-20 15:52 UTC (History)
3 users (show)

Fixed In Version: ntpsec-1.2.5-1.fc44 ntpsec-1.2.5-1.fc43
Clone Of:
Environment:
Last Closed: 2026-08-20 15:31:28 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

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.
Note You need to log in before you can comment on or make changes to this bug.