SB20261023136 - Excessive Iteration in Linux kernel openvswitch

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Main Vulnerability Database SB20261023136

SB20261023136 - Excessive Iteration in Linux kernel openvswitch

Published: October 23, 2026

Security Bulletin ID SB20261023136
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) Excessive Iteration (CVE-ID: CVE-2026-99025)

CWE-ID: CWE-834 - Excessive Iteration

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 through CPU starvation, a soft lockup, and a possible kernel panic.

The vulnerability exists due to unbounded softirq processing in the Open vSwitch netlink flow dump when retrieving flow statistics under sustained packet load and voluntary preemption. A local user can initiate a netlink flow dump under these conditions to cause the dumping thread to continuously process the replenished softirq backlog without sleeping or reaching a rescheduling point, preventing other threads from running on the affected CPU.


Remediation

Install update from vendor's website.

References