CVE-2025-70101

MEDIUM EPSS 17.7%
Published Jun 3, 20264w ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Jun 3, 2026 4w ago
Last Modified Jun 17, 2026 2w ago

Description

An out-of-bounds read in the ext4_ext_binsearch_idx function in src/ext4_extent.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by supplying a specially crafted ext4 filesystem image. The vulnerability occurs due to insufficient validation of extent header fields before performing a binary search over extent index entries, which can result in invalid pointer calculations and an out-of-bounds memory read during extent tree traversal.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
17.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 1

VendorProductVersionRange
gkostkalwext41.0.0any

References 3

  • github.com https://github.com/gkostka/lwext4/issues/91
    ExploitIssue TrackingPatch
  • github.com https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815
    Exploit
  • infosec.exchange https://infosec.exchange/@sigdevel/116668958927817708
    ExploitPatchThird Party Advisory

Remediation

  • github.com https://github.com/gkostka/lwext4/issues/91
    ExploitIssue TrackingPatch
  • infosec.exchange https://infosec.exchange/@sigdevel/116668958927817708
    ExploitPatchThird Party Advisory