{"id":"CVE-2025-70100","details":"A divide-by-zero vulnerability in the ext4_block_set_lb_size function in src/ext4_blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or image processing and leads to a Floating-Point Exception (FPE) under sanitizers or a runtime crash in standard builds due to missing validation of lb_size.","modified":"2026-07-24T03:56:52.650915986Z","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-2025-70100.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/29/5"},{"type":"WEB","url":"https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127"},{"type":"WEB","url":"https://infosec.exchange/@sigdevel/116668952003072580"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/70xxx/CVE-2025-70100.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-70100"},{"type":"REPORT","url":"https://github.com/gkostka/lwext4/issues/90"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gkostka/lwext4","events":[{"introduced":"890484c72dbb321535127625c3686e51f1f424b9"},{"last_affected":"890484c72dbb321535127625c3686e51f1f424b9"}],"database_specific":{"source":"CPE_STRING","cpe":"cpe:2.3:a:gkostka:lwext4:1.0.0:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.0.0"},{"last_affected":"1.0.0"}]}}],"versions":["1.0.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-70100.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}