SB20261022470 - Improper update of reference count in Linux kernel netfilter

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Main Vulnerability Database SB20261022470

SB20261022470 - Improper update of reference count in Linux kernel netfilter

Published: October 22, 2026

Security Bulletin ID SB20261022470
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper update of reference count (CVE-ID: CVE-2026-98851)

CWE-ID: CWE-911 - Improper Update of Reference Count

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service by preventing the removal of netfilter flowtables.

The vulnerability exists due to improper reference count management in nft_flow_offload_init() when nf_ct_netns_get() fails during flow offload rule initialization. A local privileged user can attempt rule additions that encounter this failure to leak flowtable references and prevent the affected flowtables from being removed.


Remediation

Install update from vendor's website.

References