{"id":"CVE-2025-70101","details":"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.","modified":"2026-07-15T01:48:59.712188658Z","published":"2026-06-03T00:00:00Z","database_specific":{"cna_assigner":"mitre","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/70xxx/CVE-2025-70101.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/29/6"},{"type":"WEB","url":"https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815"},{"type":"WEB","url":"https://infosec.exchange/@sigdevel/116668958927817708"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/70xxx/CVE-2025-70101.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-70101"},{"type":"REPORT","url":"https://github.com/gkostka/lwext4/issues/91"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gkostka/lwext4","events":[{"introduced":"890484c72dbb321535127625c3686e51f1f424b9"},{"last_affected":"890484c72dbb321535127625c3686e51f1f424b9"}],"database_specific":{"cpe":"cpe:2.3:a:gkostka:lwext4:1.0.0:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.0.0"},{"last_affected":"1.0.0"}],"source":"CPE_STRING"}}],"versions":["1.0.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-70101.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"}]}