CVE-2025-70100

MEDIUM EPSS 4.5%
Published Jun 3, 20263w ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jun 3, 2026 3w ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.5% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-369

Affected Products 1

VendorProductVersionRange
gkostkalwext41.0.0any

References 3

  • github.com https://github.com/gkostka/lwext4/issues/90
    ExploitIssue TrackingPatch
  • github.com https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127
    Exploit
  • infosec.exchange https://infosec.exchange/@sigdevel/116668952003072580
    ExploitPatchThird Party Advisory

Remediation

  • github.com https://github.com/gkostka/lwext4/issues/90
    ExploitIssue TrackingPatch
  • infosec.exchange https://infosec.exchange/@sigdevel/116668952003072580
    ExploitPatchThird Party Advisory