SB20260325120 - Use After Free in Linux kernel net

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Main Vulnerability Database SB20260325120

SB20260325120 - Use After Free in Linux kernel net

Published: March 25, 2026

Security Bulletin ID SB20260325120
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 security vulnerability.


1) Use After Free (CVE-ID: CVE-2026-23340)

The vulnerability allows a local user to execute arbitrary code or cause a denial of service.

The vulnerability exists due to a use-after-free in the network scheduler (qdisc) component when resetting transmit queues for lockless qdiscs during changes in the number of real transmit queues. A local user can trigger a race condition between qdisc_reset() and the packet dequeue path, leading to use-after-free and potential execution of arbitrary code or system crash.

Exploitation requires the ability to modify network interface queue configurations, which typically requires local user privileges. The issue affects systems using lockless qdiscs such as pfifo_fast, especially under high network load and frequent queue resizing operations.


Remediation

Install update from vendor's website.

References