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CVE-2025-70100

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5917db82baa8c5c2f1815e9607fd7255b24cedf3bf66ed723278ab1b4e785d97
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-369","description":"CWE-369 Divide By Zero","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"n/a","lang":"en","type":"text"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-369","description":"CWE-369 Divide By Zero","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/adp/0/problemTypes/0/descriptions/0
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/06/29/5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/adp/1/references/0
{"tags":["exploit"],"url":"https://github.com/gkostka/lwext4/issues/90"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/adp/0/references/0
{"url":"https://github.com/gkostka/lwext4/issues/90"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/cna/references/0
{"url":"https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/cna/references/1
{"url":"https://infosec.exchange/@sigdevel/116668952003072580"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:636d3cc805c913fa3c5bb7f9cabae7d658891a29c654b36e63f022664bfcf203 · sha256:e8cf8a098e082069… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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