PT-2026-45935 · Lwext4 · Lwext4

CVE-2025-70101 · Published 2026-06-03 · Updated 2026-07-01

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions lwext4 version 1.0.0

Description An out-of-bounds read exists in the ext4 ext binsearch idx() function within the src/ext4 extent.c file. This occurs because extent header fields are not sufficiently validated before a binary search is performed over extent index entries. Consequently, invalid pointer calculations can lead to an out-of-bounds memory read during extent tree traversal, allowing an attacker to cause a denial of service by providing a specially crafted ext4 filesystem image.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2025-70101

Affected Products

Lwext4

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/70xxx/CVE-2025-70101.json · Exploit
• 🔥 https://github.com/gkostka/lwext4/issues/91 · Exploit
• 🔥 https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815 · Exploit
• https://osv.dev/vulnerability/CVE-2025-70101 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-70101 · Security Note
• https://infosec.exchange/@sigdevel/116668958927817708 · Patch
• https://t.me/cveNotify/179191 · Telegram Post
• https://twitter.com/oss_security/status/2072379584230682874 · Twitter Post
• http://openwall.com/lists/oss-security/2026/06/29/6 · Note
• https://t.me/CVEtracker/55715 · Telegram Post
• https://t.me/cveNotify/166297 · Telegram Post