SB20260812417 - Integer underflow in Linux kernel openvswitch

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Main Vulnerability Database SB20260812417

SB20260812417 - Integer underflow in Linux kernel openvswitch

Published: August 12, 2026

Security Bulletin ID SB20260812417
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) Integer underflow (CVE-ID: CVE-2026-68123)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 6.8 [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]


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

The vulnerability exists due to an integer underflow in queue_userspace_packet() in the openvswitch subsystem when processing userspace actions on segmented gso packets after truncation. A local user can send a specially crafted packet that triggers truncation and segmentation handling to cause a denial of service.

The issue occurs because truncation state is reused across smaller gso segments, allowing the preserved length value to exceed the current packet length.


Remediation

Install update from vendor's website.

References