SB2026050951 - NULL pointer dereference in Linux kernel bpf

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Main Vulnerability Database SB2026050951

SB2026050951 - NULL pointer dereference in Linux kernel bpf

Published: May 9, 2026

Security Bulletin ID SB2026050951
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-2026-43333)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 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/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper access control in the BPF verifier check_mem_access() handling of PTR_TO_BUF pointers when processing direct memory access to nullable map iterator key and value pointers. A local user can trigger direct dereference of a NULL pointer to cause a denial of service.

The issue occurs on stop callbacks where map iterator ctx->key and ctx->value can be NULL.


Remediation

Install update from vendor's website.

References