# Kernel Memory usage increases persistently each day on a Security Gateway / Security Group when CGNAT is enabled

## Product
Maestro HyperScale Firewall, Scalable Chassis, Security Gateways

## Version
R80.40 (EOS), R81 (EOS), R81.10 (EOS), R81.20

## OS
Gaia

## Last Modified
2024-10-22

## Symptoms
- Kernel Memory usage increases persistently each day on a Security Gateway / Scalable Platform Security Group.

Memory usage can be monitored with these commands:
- On a Security Gateway: `fw ctl pstat`
- On a Security Group: `asg perf`

## Cause
When Carrier Grade NAT (CGNAT) is enabled (see [sk120296](https://support.checkpoint.com/results/sk/sk120296)), it may cause a memory leak in the kernel table for CoreXL global connections (use the "`fw ctl multik gconn -s`" command to see this table).

## Solution
This problem was fixed. The fix is included in:
- [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 79
- [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 158
- [Jumbo Hotfix Accumulator for R81](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81/Default.htm) starting from Take 106

If you choose not to upgrade, Check Point can supply a **Hotfix**. [Contact Check Point Support](https://www.checkpoint.com/support-services/.contact-support/) to get a Hotfix for this issue.

A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.

For faster resolution and verification, please collect [CPinfo files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

**Hotfix installation instructions:**

Refer to [sk168597 - How to install a Hotfix](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168597).

#### NOTE
This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

## Article Properties
Access Level: General
Status: Approved by TAC
Date Created: 2024-03-25
Last Modified: 2024-10-22