Last Modified: Oct 06, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5, 17.5.1.6, 17.5.1.8, 17.5.1.9, 21.0.0, 21.0.0.1, 21.0.0.2, 21.0.0.3, 21.1.0, 21.1.0.1, 21.1.0.2
Opened: Sep 21, 2026 Severity: 2-Critical
TMM stops updating its heartbeat, and the system restarts TMM and writes a core file. The /var/log/ltm file shows messages similar to the following: 01140041:5: Killing tmm.0 pid <pid> 01140029:4: HA daemon_heartbeat tmm fails action is go offline down links and restart
Traffic disrupted while tmm restarts
- BIG-IP Virtual Edition runs in Microsoft Azure or Hyper-V - The data plane interfaces use the DPDK netvsc driver - A network interface link status check does not complete within approximately 10 seconds
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