SB20261022209 - Use-after-free in Linux kernel netfilter

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Main Vulnerability Database SB20261022209

SB20261022209 - Use-after-free in Linux kernel netfilter

Published: October 22, 2026

Security Bulletin ID SB20261022209
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-2026-98625)

CWE-ID: CWE-416 - Use After Free

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 a use-after-free in the Linux kernel.

The vulnerability exists due to a use-after-free in the netfilter flowtable hardware offload worker when flow destruction overlaps with garbage collection. A local user can potentially trigger a race in which NF_FLOW_HW_DEAD is set before NF_FLOW_HW_PENDING is cleared, allowing garbage collection and an RCU callback to free the flow before the worker resumes accessing it, to cause a denial of service.


Remediation

Install update from vendor's website.

References