CVE-2025-70101

CVSS 6.5 MEDIUMEPSS 0.3%CWE-125

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

03 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

Affected products

n/a · n/a

References

https://github.com/gkostka/lwext4/issues/91 https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815 https://infosec.exchange/@sigdevel/116668958927817708 http://www.openwall.com/lists/oss-security/2026/06/29/6