{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2025-70100", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-06-03T13:51:17.592Z", "dateReserved": "2026-01-09T00:00:00.000Z", "datePublished": "2026-06-03T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-06-03T13:51:17.592Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://github.com/gkostka/lwext4/issues/90"}, {"url": "https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127"}, {"url": "https://infosec.exchange/@sigdevel/116668952003072580"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}}, "dataVersion": "5.2"}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2025-70100", "lastModified": "2026-06-03T14:16:31.217", "metrics": {}, "published": "2026-06-03T14:16:31.217", "references": [{"source": "cve@mitre.org", "url": "https://github.com/gkostka/lwext4/issues/90"}, {"source": "cve@mitre.org", "url": "https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127"}, {"source": "cve@mitre.org", "url": "https://infosec.exchange/@sigdevel/116668952003072580"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.0.0"}}], "enrichment": {"confidence": 90.0, "confidence_source": "inferred", "scores": [{"score": 90.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "lwext4", "vendor": "gkostka"}], "created": "2026-06-03T15:30:26.541509+00:00", "title": "Divide\u2011by\u2011Zero in lwext4 Ext4 Block Size Validation Leading to DoS", "updated": "2026-06-03T16:30:35.975963+00:00", "vendors": ["gkostka", "gkostka$PRODUCT$lwext4"], "weaknesses": ["CWE-369"]}