SB20261007129 - Use-after-free in Linux kernel ethernet microchip driver

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Main Vulnerability Database SB20261007129

SB20261007129 - Use-after-free in Linux kernel ethernet microchip driver

Published: October 7, 2026

Security Bulletin ID SB20261007129
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-98239)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to write to freed kernel memory.

The vulnerability exists due to use-after-free in lan743x_rx_process_buffer() when processing checksum-success packets that span multiple receive buffers. A remote attacker can send a packet that spans multiple receive buffers to write to freed kernel memory.

Receive checksum offload must be enabled. Multi-buffer reception can occur after a live MTU increase because existing receive ring entries retain their old buffer size until replenished.


Remediation

Install update from vendor's website.

References