SB20260816281 - NULL pointer dereference in Linux kernel netfilter

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Main Vulnerability Database SB20260816281

SB20260816281 - NULL pointer dereference in Linux kernel netfilter

Published: August 16, 2026

Security Bulletin ID SB20260816281
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) NULL pointer dereference (CVE-ID: CVE-2026-72254)

CWE-ID: CWE-476 - NULL Pointer Dereference

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 NULL pointer dereference in the nft_fib netdev egress hook handling when evaluating a fib expression in a netdev egress base chain. A local user can create a crafted nftables rule using a fib expression on the netdev egress hook to cause a denial of service.

The issue occurs because netdev hook numbers alias NF_INET_* values, allowing an egress chain to pass validation and then fault on the transmit path when nft_in(pkt) is NULL.


Remediation

Install update from vendor's website.

References