SB20260325171 - NULL Pointer Dereference in Linux kernel atm

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Main Vulnerability Database SB20260325171

SB20260325171 - NULL Pointer Dereference in Linux kernel atm

Published: March 25, 2026

Security Bulletin ID SB20260325171
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-2026-23286)

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 the ATM LANE (LAN Emulation) module when handling VCC closure. A local user can trigger the closure of a shared atm_vcc, which is referenced by multiple lec_arp_table entries, causing a null-ptr-deref crash during subsequent cleanup attempts.

The issue arises because the cleanup function lec_arp_clear_vccs() does not verify whether the associated private data (vpriv) has already been released, leading to a crash upon dereferencing a NULL pointer in a later iteration.


Remediation

Install update from vendor's website.

References