SB20260625247 - NULL pointer dereference in Linux kernel core

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Main Vulnerability Database SB20260625247

SB20260625247 - NULL pointer dereference in Linux kernel core

Published: June 25, 2026

Security Bulletin ID SB20260625247
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-2026-52938)

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 a NULL pointer dereference in bpf_sk_storage_clone() and bpf_sk_storage_diag_put_all() when processing socket local storage entries during concurrent access. A local user can trigger concurrent operations that leave smap as NULL while the storage element remains visible to RCU readers to cause a denial of service.

The issue arises in the BPF socket storage handling paths under a race condition involving RCU readers.


Remediation

Install update from vendor's website.

References