---
id: CVE-2025-21788
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ethernet: ti: am65-cpsw: fix memleak in certain XDP cases

  If the XDP program doesn't result in XDP_PASS then we leak the
  memory allocated by am65_cpsw_build_skb()…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ethernet: ti: am65-cpsw: fix memleak in certain XDP cases

  If the XDP program doesn't result in XDP_PASS then we leak the
  memory allocated by am65_cpsw_build_skb()…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-401
  - CWE-401
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.10, < 6.12.16'
  - 'linux_kernel >= 6.13, < 6.13.4'
  - linux_kernel = 6.14
patched:
  - linux_kernel 6.13.4
published: '2025-02-27'
updated: '2026-07-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-21788'
references:
  - url: 'https://git.kernel.org/stable/c/1bba1d042107167164a0ae3a843fdf650ab005d7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5db843258de1e4e6b1ef1cbd1797923c9e3de548'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dc11f049612b9d926aca2e55f8dc9d82850d0da3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00498
epssPercentile: 0.40136
ingestedAt: '2026-07-30T06:53:09.951Z'
---

## Overview

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

net: ethernet: ti: am65-cpsw: fix memleak in certain XDP cases

If the XDP program doesn't result in XDP_PASS then we leak the
memory allocated by am65_cpsw_build_skb().

It is pointless to allocate SKB memory before running the XDP
program as we would be wasting CPU cycles for cases other than XDP_PASS.
Move the SKB allocation after evaluating the XDP program result.

This fixes the memleak. A performance boost is seen for XDP_DROP test.

XDP_DROP test:
Before: 460256 rx/s                  0 err/s
After:  784130 rx/s                  0 err/s

## Affected

- `linux_kernel >= 6.10, < 6.12.16`
- `linux_kernel >= 6.13, < 6.13.4`
- `linux_kernel = 6.14`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.13.4`