Last Modified: Jul 28, 2026
Affected Product(s):
BIG-IP AFM
Fixed In:
17.5.1.8, 17.1.3.4
Opened: Apr 30, 2026 Severity: 2-Critical
AFM provisioned, TMM crash, holds a stale classifier reference into a freed DWBL blob, causing SIGSEGV
TMM restarts
A virtual server with an IP intelligence policy is modified at the same time dwbld activates a new blob in TMM, may causing the VIP's classifier update to be silently skipped
None
The DWBL classifier now maintains a reference-counted pointer to the blob it is associated with. When a classifier is created or updated, it acquires a reference. When it is freed, it releases that reference. Instead of immediately freeing the old blob, it is marked as retired and is only actually freed when the reference count reaches zero, and the retired status is set to TRUE.