Last Modified: Mar 27, 2026
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
17.5.1.3, 17.5.1.4, 17.5.1.5
Opened: Dec 29, 2025 Severity: 2-Critical
TMM crashes and restarts.
Traffic disrupted while tmm restarts.
In an F5OS multi-slot tenant environment, during boot-up after a tmsh reboot slot all or upgrading to a new volume, a switch of the primary slot can occur between the slots due to slot readiness states. If tmm sends a shared_random_data message before receiving the updated primary slot ID from mcpd, it might use the previous primary slot ID, resulting in a data mismatch and causing tmm to crash and restart. Note: This issue occurs very rarely as it depends on a race condition.
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