BugZero | F5 BugID 760438 - PEM iRule to set policy in rigorous loop may crash...

F5 - Defect ID: 760438

PEM iRule to set policy in rigorous loop may crash tmm due to rare timing conditions

F5 - Defect ID: 760438

PEM iRule to set policy in rigorous loop may crash tmm due to rare timing conditions

Last updated on July 18th, 2026

BugZero Risk Score
6.8 Medium

Overall: 6.8

Severity: 7.3

Community: 4.2

Lifecycle: 7.8

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Bug Details

Priority: 3-Major
Status: Not Verified
Impact Category: Policy Enforcement Manager

Description

Symptoms

tmm coredump

Impact

Traffic impact due to tmm coredump. Traffic disrupted while tmm restarts.

Conditions

-- Using an iRule to apply a referential policy in a rigorous loop. -- This is a rarely occurring timing issue.

Workaround

None.

Fix Information

The BIG-IP system now validates session presence before applying the policy.

Change history

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:12.1.0, 12.1.0 hf1, 12.1.0 hf2, 12.1.1, 12.1.1 hf1, 12.1.1 hf2, 12.1.2, 12.1.2 hf1, 12.1.2 hf2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6, 13.0.0, 13.0.0 hf1, 13.0.0 hf2, 13.0.0 hf3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2

Fixed versions: 15.0.0, 14.1.2.1, 13.1.3

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 15.0.0, 14.1.2.1, 13.1.3

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F5 - Defect ID: 760438

PEM iRule to set policy in rigorous loop may crash tmm due to rare timing conditions

F5 - Defect ID: 760438

PEM iRule to set policy in rigorous loop may crash tmm due to rare timing conditions

Last updated on July 18th, 2026

BugZero Risk Score6.8 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 760438

PEM iRule to set policy in rigorous loop may crash tmm due to rare timing conditions

F5 - Defect ID: 760438

PEM iRule to set policy in rigorous loop may crash tmm due to rare timing conditions

Last updated on July 18th, 2026

BugZero Risk Score6.8 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.8 Medium

BugZero Risk Score
6.8 Medium