CVE-2025-70101: n/a
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.
AI Analysis
Technical Summary
The vulnerability CVE-2025-70101 affects the lwext4 1.0.0 library in the ext4_ext_binsearch_idx function within src/ext4_extent.c. It arises from inadequate validation of extent header fields prior to performing a binary search over extent index entries. This flaw can cause invalid pointer arithmetic, leading to an out-of-bounds memory read during extent tree traversal. Exploitation requires an attacker to provide a maliciously crafted ext4 filesystem image, which can trigger a denial of service condition. There is no vendor advisory or patch information available at this time.
Potential Impact
Successful exploitation of this vulnerability allows an attacker to cause a denial of service by triggering an out-of-bounds read, potentially crashing the affected application or system using the lwext4 1.0.0 library. The CVSS score of 6.5 reflects a medium severity with high confidentiality impact but no integrity or availability impact beyond denial of service. There are no known exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted ext4 filesystem images with the affected lwext4 1.0.0 library to mitigate risk.
CVE-2025-70101: n/a
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 v3.1
Score 6.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2025-70101 affects the lwext4 1.0.0 library in the ext4_ext_binsearch_idx function within src/ext4_extent.c. It arises from inadequate validation of extent header fields prior to performing a binary search over extent index entries. This flaw can cause invalid pointer arithmetic, leading to an out-of-bounds memory read during extent tree traversal. Exploitation requires an attacker to provide a maliciously crafted ext4 filesystem image, which can trigger a denial of service condition. There is no vendor advisory or patch information available at this time.
Potential Impact
Successful exploitation of this vulnerability allows an attacker to cause a denial of service by triggering an out-of-bounds read, potentially crashing the affected application or system using the lwext4 1.0.0 library. The CVSS score of 6.5 reflects a medium severity with high confidentiality impact but no integrity or availability impact beyond denial of service. There are no known exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted ext4 filesystem images with the affected lwext4 1.0.0 library to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-01-09T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2037c3e29bf47b50c14d9d
Added to database: 06/03/2026, 14:18:43 UTC
Last enriched: 06/29/2026, 20:58:43 UTC
Last updated: 07/31/2026, 19:22:56 UTC
Views: 51
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