CVE-2026-102485: NTPsec ntpd out-of-bounds read in Motorola Oncore driver

CVE-2026-102485 · Severity: medium · CVSS 5.2 · Published 2026-10-21

NTPsec ntpd is a network time synchronization daemon used to keep computer clocks accurate across networks. An attacker who can control a Motorola Oncore GPS receiver's serial data can crash ntpd or read sensitive memory by sending a malformed GPS response, disrupting time synchronization and potentially enabling further attacks.

Technologies: Ntpsec Ntpd. Vendors: Ntpsec.

Quick answers

Is CVE-2026-102485 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-102485 being exploited in the wild.
How severe is CVE-2026-102485?
Medium severity, with a CVSS score of 5.2, published 21 October 2026.
Which products and versions are affected?
Ntpsec Ntpd before 1.2.6.
Is there a fix for CVE-2026-102485?
Yes: fixed in NTPsec ntpd 1.2.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-102485 attacked?
It is attacked over the network or from the adjacent network, in a hosted service.
Am I affected by CVE-2026-102485?
Check whether you run Ntpsec Ntpd at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: NTPsec ntpd 1.2.6

Technical details

An out-of-bounds read vulnerability exists in the Motorola Oncore refclock driver (refclock_oncore.c) where an unchecked user-controlled byte from a PPS Control (@@Gc) reply is used as an array index without bounds checking. An attacker controlling the GPS receiver's serial data can trigger a read beyond the 4-element lookup table, causing denial of service or information disclosure. The fix adds a bounds check and replaces out-of-range indices with a safe default value.

Affected products

  • NTPsec ntpd before 1.2.6

Timeline

  • 2026-09-28: patched: Patch committed to fix tbl[4] index overflow
  • 2026-10-21: disclosed

References

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