SB20260424256 - Use-after-free in Linux kernel net driver

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Main Vulnerability Database SB20260424256

SB20260424256 - Use-after-free in Linux kernel net driver

Published: April 24, 2026

Security Bulletin ID SB20260424256
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-2026-31469)

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 virtio_net driver transmit path when transmitting packets after the network namespace is destroyed while previously queued skbs are still pending. A local user can trigger packet transmission and network namespace teardown to cause a denial of service.

The issue occurs when the virtio_net driver is configured with napi_tx disabled and the device's IFF_XMIT_DST_RELEASE flag is cleared.


Remediation

Install update from vendor's website.

References