CVE-2026-34961 — Out-of-Bounds $1

title: Barebox ext4 Out-of-Bounds Read Attempt via Malicious Filesystem Image — CVE-2026-34961
id: scw-2026-05-11-ai-1
status: experimental
level: critical
description: |
  Detects potential exploitation of CVE-2026-34961 by identifying barebox processes attempting to parse ext4 filesystems, specifically looking for indicators related to the vulnerable ext4_common.c file during boot-time filesystem parsing. This rule aims to catch the initial attempt to exploit the out-of-bounds read vulnerability when a malicious ext4 filesystem image is presented via USB, SD card, or network boot.
author: SCW Feed Engine (AI-generated)
date: 2026-05-11
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-34961/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: process_creation
detection:
  selection:
      Image|contains:
          - 'barebox'
      ParentImage|contains:
          - 'boot'
      CommandLine|contains:
          - 'ext4'
      CommandLine|contains:
          - 'fs/ext4/ext4_common.c'
      condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse