PT-2026-45934 · Undefined · Undefined

Published 2026-06-03 · Updated 2026-06-03 · CVE-2025-70100

NVD

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

A divide-by-zero vulnerability in the ext4 block set lb size function in src/ext4 blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or image processing and leads to a Floating-Point Exception (FPE) under sanitizers or a runtime crash in standard builds due to missing validation of lb size.

Exploit

Fix

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

CVE-2025-70100

Affected Products

Undefined

References · 4

• 🔥 https://github.com/gkostka/lwext4/issues/90 · Exploit
• 🔥 https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-70100 · Security Note
• https://infosec.exchange/@sigdevel/116668952003072580 · Note