---
id: "CVE-2026-99029"
kind: "vulnerability"
aliases: ["CVE-2026-99029"]
title: "Linux kernel: sparx5 matchall filter deletion leaks memory on each destroy"
severity: "low"
cvss: null
epss: 0.00209
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "lan969x", "linux-kernel", "network-driver", "sparx5"]
not_affected_if: ["no-sparx5-hardware"]
published_at: "2026-10-23T13:17:25+00:00"
first_seen_at: "2026-10-23T21:57:33+00:00"
updated_at: "2026-10-25T12:38:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99029", "first_seen_at": "2026-10-23T21:57:33+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-99029", "first_seen_at": "2026-10-25T12:38:50+00:00"}]
---

# Linux kernel: sparx5 matchall filter deletion leaks memory on each destroy

The Linux kernel's Microchip Sparx5 switch driver does not free the entry it allocates for each offloaded matchall traffic filter when that filter is deleted. Repeatedly adding and deleting such filters leaks kernel memory.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- Update the Linux kernel to a release that includes the commit "net: sparx5: free the matchall entry on destroy" (exact version unknown from sources)

## Timeline

- 2026-10-23T21:57:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-99029
- 2026-10-25T12:38:50+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-99029

## From the sources

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

net: sparx5: free the matchall entry on destroy

sparx5_tc_matchall_replace() allocates a struct sparx5_mall_entry for
every offloaded matchall filter and adds it to sparx5->mall_entries.
sparx5_tc_matchall_destroy() removes the entry from the list, but never
frees it, so the entry of every deleted mirror and goto matchall filter
is leaked.

Free the entry after unlinking it.

The leak was discovered by an AI code review agent, and reproduced with
kmemleak on a lan969x EV board (EV23X71A) by repeatedly adding and
deleting matchall mirror and goto filters. With the fix, kmemleak no
longer reports the leak.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_