gpsd bug

Paul Theodoropoulos paul at
Fri Oct 22 00:02:30 UTC 2021

(re-sending as my subject line previously may have tripped a spam trigger)

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GPS Daemon (GPSD) Rollover Bug 
10/21/2021 03:36 PM EDT

Original release date: October 21, 2021

Critical Infrastructure (CI) owners and operators, and other users who 
obtain Coordinated Universal Time (UTC) from Global Positioning System 
(GPS) devices, should be aware of a GPS Daemon (GPSD) bug 
<> in GPSD versions 3.20 
(released December 31, 2019) through 3.22 (released January 8, 2021).

On October 24, 2021, Network Time Protocol (NTP) servers using bugged GPSD 
versions 3.20-3.22 may rollback 
the date 1,024 weeks—to March 2002—which may cause systems and services to 
become unavailable or unresponsive.

CISA urges affected CI owners and operators to ensure systems—that use 
GPSD to obtain timing information from GPS devices—are using GPSD version 
3.23 <> (released August 8, 2021) or newer.

For more information, see Keeping Track of Time: Network Time Protocol and 
a GPSD Bug 

Paul Theodoropoulos

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