SB20260507108 - Use-after-free in Linux kernel net wan driver

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Main Vulnerability Database SB20260507108

SB20260507108 - Use-after-free in Linux kernel net wan driver

Published: May 7, 2026

Security Bulletin ID SB20260507108
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

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-2026-43232)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in the FarSync WAN driver tasklet handlers when detaching a FarSync T-series card while scheduled tasklets are still running or pending. A local user can trigger device removal during tasklet processing to cause a denial of service.

The issue is caused by a race condition between cleanup in fst_remove_one() and the fst_tx_task or fst_int_task tasklets accessing fst_card_info in fst_process_tx_work_q() or fst_process_int_work_q().


Remediation

Install update from vendor's website.

References