Medium severity6.5NVD Advisory· Published Jun 3, 2026· Updated Jul 22, 2026
CVE-2025-70101
CVE-2025-70101
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.
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Affected products
2Patches
Vulnerability mechanics
References
4- github.com/gkostka/lwext4/issues/91nvdExploitIssue TrackingPatch
- github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815nvdExploit
- infosec.exchange/@sigdevel/116668958927817708nvdExploitPatchThird Party Advisory
- www.openwall.com/lists/oss-security/2026/06/29/6nvd
News mentions
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