SUSE-SU-2025:20862-1
Security update for chrony
SUSE-SU-2025:20862-1 is a vulnerability with no CVSS score yet in chrony, published October 17, 2025. No source lists public exploit code. Fixed in chrony 4.8-slfo.1.1_1.1.
- Severity
- UnratedNo CVSS score yet
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
4.8-slfo.1.1_1.1chrony
Description
This update for chrony fixes the following issues:
Update to version 4.8:
- Add maxunreach option to limit selection of unreachable sources
- Add -u option to chronyc to drop root privileges (default chronyc user is set by configure script)
- Fix refclock extpps option to work on Linux >= 6.15
- Validate refclock samples for reachability updates
Fix racy socket creation which allows privilege escalation to root (bsc#1246544)
Update to version 4.7:
- Add opencommands directive to select remote monitoring commands
- Add interval option to driftfile directive
- Add waitsynced and waitunsynced options to local directive
- Add sanity checks for integer values in configuration
- Add support for systemd Type=notify service
- Add RTC refclock driver
- Allow PHC refclock to be specified with network interface name
- Don’t require multiple refclock samples per poll to simplify filter configuration
- Keep refclock reachable when dropping samples with large delay
- Improve quantile-based filtering to adapt faster to larger delay
- Improve logging of selection failures
- Detect clock interference from other processes
- Try to reopen message log (-l option) on cyclelogs command
- Fix sourcedir reloading to not multiply sources
- Fix tracking offset after failed clock step
- Drop support for NTS with Nettle < 3.6 and GnuTLS < 3.6.14
- Drop support for building without POSIX threads
Update to version 4.6.1:
- Add ntsaeads directive to enable only selected AEAD algorithms for NTS.
- Negotiate use of compliant NTS keys with AES-128-GCM-SIV AEAD algorithm.
- Switch to compliant NTS keys if first response from server is NTS NAK.
Drop rcFOO symlinks for CODE16 (PED-266).
Update to version 4.6:
- Add activate option to local directive to set activation threshold
- Add ipv4 and ipv6 options to server/pool/peer directive
- Add kod option to ratelimit directive for server KoD RATE support
- Add leapseclist directive to read NIST/IERS leap-seconds.list file
- Add ptpdomain directive to set PTP domain for NTP over PTP
- Allow disabling pidfile
- Improve copy server option to accept unsynchronised status instantly
- Log one selection failure on start
- Add offset command to modify source offset correction
- Add timestamp sources to ntpdata report
- Fix crash on sources reload during initstepslew or RTC initialisation
- Fix source refreshment to not repeat failed name resolving attempts
Affected packages
| Package | Affected | Fixed |
|---|---|---|
chronySUSE:Linux Micro 6.1 | before 4.8-slfo.1.1_1.1 | 4.8-slfo.1.1_1.1 |
What each source reports
OSVNo score
Security update for chrony
This update for chrony fixes the following issues:
Update to version 4.8:
- Add maxunreach option to limit selection of unreachable sources
- Add -u option to chronyc to drop root privileges (default chronyc user is set by configure script)
- Fix refclock extpps option to work on Linux >= 6.15
- Validate refclock samples for reachability updates
Fix racy socket creation which allows privilege escalation to root (bsc#1246544)
Update to version 4.7:
- Add opencommands directive to select remote monitoring commands
- Add interval option to driftfile directive
- Add waitsynced and waitunsynced options to local directive
- Add sanity checks for integer values in configuration
- Add support for systemd Type=notify service
- Add RTC refclock driver
- Allow PHC refclock to be specified with network interface name
- Don’t require multiple refclock samples per poll to simplify filter configuration
- Keep refclock reachable when dropping samples with large delay
- Improve quantile-based filtering to adapt faster to larger delay
- Improve logging of selection failures
- Detect clock interference from other processes
- Try to reopen message log (-l option) on cyclelogs command
- Fix sourcedir reloading to not multiply sources
- Fix tracking offset after failed clock step
- Drop support for NTS with Nettle < 3.6 and GnuTLS < 3.6.14
- Drop support for building without POSIX threads
Update to version 4.6.1:
- Add ntsaeads directive to enable only selected AEAD algorithms for NTS.
- Negotiate use of compliant NTS keys with AES-128-GCM-SIV AEAD algorithm.
- Switch to compliant NTS keys if first response from server is NTS NAK.
Drop rcFOO symlinks for CODE16 (PED-266).
Update to version 4.6:
- Add activate option to local directive to set activation threshold
- Add ipv4 and ipv6 options to server/pool/peer directive
- Add kod option to ratelimit directive for server KoD RATE support
- Add leapseclist directive to read NIST/IERS leap-seconds.list file
- Add ptpdomain directive to set PTP domain for NTP over PTP
- Allow disabling pidfile
- Improve copy server option to accept unsynchronised status instantly
- Log one selection failure on start
- Add offset command to modify source offset correction
- Add timestamp sources to ntpdata report
- Fix crash on sources reload during initstepslew or RTC initialisation
- Fix source refreshment to not repeat failed name resolving attempts
- Record
SUSE-SU-2025:20862-1- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.