SB20260816120 - Use-after-free in Linux kernel netfilter

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Main Vulnerability Database SB20260816120

SB20260816120 - Use-after-free in Linux kernel netfilter

Published: August 16, 2026

Security Bulletin ID SB20260816120
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-2026-72255)

CWE-ID: CWE-416 - Use After Free

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 a use-after-free in nf_queue handling of bridge fake dst references when processing bridged packets queued to NFQUEUE. A local user can queue bridged packets to NFQUEUE during bridge device teardown to cause a denial of service.

The issue affects systems with CONFIG_BRIDGE_NETFILTER enabled and involves queued packets carrying a fake rtable associated with a bridge device.


Remediation

Install update from vendor's website.

References