SB20261022234 - Division by zero in Linux kernel bpf

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Main Vulnerability Database SB20261022234

SB20261022234 - Division by zero in Linux kernel bpf

Published: October 22, 2026

Security Bulletin ID SB20261022234
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) Division by zero (CVE-ID: CVE-2026-98647)

CWE-ID: CWE-369 - Divide By Zero

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service by triggering a kernel divide-by-zero exception.

The vulnerability exists due to an unchecked zero divisor in btf_struct_walk() when validating an access beyond a structure ending in a flexible array whose element type has zero size. A local privileged user can load a specially crafted BPF program that accesses the structure through a PTR_TO_BTF_ID pointer not marked MEM_ALLOC to trigger a modulo-by-zero operation during verification and cause a denial of service.


Remediation

Install update from vendor's website.

References