---
title: "CVE-2026-98239: Linux kernel lan743x - Use After Free"
description: "Linux kernel net: lan743x contains a use-after-free vulnerability caused by improper handling of RX checksum in lan743x_rx_process_buffer, letting attackers cause memory corruption, exploit requires multi-buffer packet reception."
url: https://panop.io/threat-heartbeat/CVE-2026-98239/
---

# CVE-2026-98239 Linux kernel lan743x - Use After Free

Linux kernel net: lan743x contains a use-after-free vulnerability caused by improper handling of RX checksum in lan743x\_rx\_process\_buffer, letting attackers cause memory corruption, exploit requires multi-buffer packet reception.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.47% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98239)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

6 October 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-98239](https://nvd.nist.gov/vuln/detail/CVE-2026-98239)
- [https://git.kernel.org/stable/c/6fe5c3a2503983abb431d93faeadfc7f5e6a7e33](https://git.kernel.org/stable/c/6fe5c3a2503983abb431d93faeadfc7f5e6a7e33)
- [https://git.kernel.org/stable/c/a58024835c704419bb46d2a34e5223f65605f958](https://git.kernel.org/stable/c/a58024835c704419bb46d2a34e5223f65605f958)
- [https://git.kernel.org/stable/c/a9ce4053dc945c5372dedba5017ee675b30dc0c5](https://git.kernel.org/stable/c/a9ce4053dc945c5372dedba5017ee675b30dc0c5)
- [https://git.kernel.org/stable/c/0e52886c4324c9897c2c62f92be3dc8316cee67e](https://git.kernel.org/stable/c/0e52886c4324c9897c2c62f92be3dc8316cee67e)
- [https://git.kernel.org/stable/c/161a403c8625e152de03d1da22bbf9cda6dc9f9f](https://git.kernel.org/stable/c/161a403c8625e152de03d1da22bbf9cda6dc9f9f)
- [https://git.kernel.org/stable/c/5c216bfa9fb7b36804485e67975e9c98055b31ef](https://git.kernel.org/stable/c/5c216bfa9fb7b36804485e67975e9c98055b31ef)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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