CVE-2026-43157: octeontx2-af: CGX: fix bitmap leaks

Q: When does the memory leak occur?

The leak is triggered when the octeontx2-af CGX driver is unbound and then rebound. During initialization, RX/TX flow-control bitmaps are allocated, but the affected teardown path does not free them.

Q: How can I determine whether this issue is present?

A system using the affected driver may report a kmemleak warning after an unbind/rebind cycle, identifying an unreferenced 16-byte object with a backtrace involving rvu_alloc_bitmap and cgx_probe.

Q: What should be done to remediate the issue?

Apply an available Linux kernel patch that frees the RX and TX flow-control bitmaps during cgx_lmac_exit().

Published May 6, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved:

octeontx2-af: CGX: fix bitmap leaks

The RX/TX flow-control bitmaps (rxfcpfvfbmap and txfcpfvfbmap) are allocated by cgxlmacinit() but never freed in cgxlmacexit(). Unbinding and rebinding the driver therefore triggers kmemleak:

unreferenced object (size 16): backtrace: rvuallocbitmap cgxprobe

Free both bitmaps during teardown.

Affected Software

6 affected components

Linux Linux kernel

Linux Linux kernel>=5.18<6.1.165

Linux Linux kernel>=6.2<6.6.128

Linux Linux kernel>=6.7<6.12.75

Linux Linux kernel>=6.13<6.18.16

Linux Linux kernel>=6.19<6.19.6

Remediation

Event History

May 6, 2026

CVE Published

via MITRE·11:27 AM

Data Sourced

via MITRE·11:27 AM

Description

Data Sourced

via NVD·12:16 PM

RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

When does the memory leak occur?

The leak is triggered when the octeontx2-af CGX driver is unbound and then rebound. During initialization, RX/TX flow-control bitmaps are allocated, but the affected teardown path does not free them.

How can I determine whether this issue is present?

A system using the affected driver may report a kmemleak warning after an unbind/rebind cycle, identifying an unreferenced 16-byte object with a backtrace involving rvu_alloc_bitmap and cgx_probe.

What should be done to remediate the issue?

Apply an available Linux kernel patch that frees the RX and TX flow-control bitmaps during cgx_lmac_exit().

CVE-2026-43157: octeontx2-af: CGX: fix bitmap leaks

Affected Software

Remediation

Patch Available

Patch Available

Patch Available

Patch Available

Patch Available

Patch Available

Event History

Frequently Asked Questions

When does the memory leak occur?

How can I determine whether this issue is present?

What should be done to remediate the issue?

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Frequently Asked Questions

When does the memory leak occur?

How can I determine whether this issue is present?

What should be done to remediate the issue?