FKIE_CVE-2025-70101

Vulnerability from fkie_nvd - Published: 2026-06-03 14:16 - Updated: 2026-06-29 20:17
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Summary
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.
References
cve@mitre.orghttps://github.com/gkostka/lwext4/issues/91Exploit, Issue Tracking, Patch
cve@mitre.orghttps://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815Exploit
cve@mitre.orghttps://infosec.exchange/@sigdevel/116668958927817708Exploit, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/06/29/6
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/gkostka/lwext4/issues/91Exploit, Issue Tracking, Patch
Impacted products
Vendor Product Version
gkostka lwext4 1.0.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
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      "source": "cve@mitre.org"
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  "configurations": [
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              "matchCriteriaId": "70BC7F76-4450-4CC3-8C76-64CBB6EC4740",
              "vulnerable": true
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          "negate": false,
          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
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      "value": "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."
    }
  ],
  "id": "CVE-2025-70101",
  "lastModified": "2026-06-29T20:17:32.083",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-70101",
          "options": [
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              "exploitation": "poc"
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            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
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          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-03T17:35:26.349072Z",
          "version": "2.0.3"
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  "published": "2026-06-03T14:16:31.340",
  "references": [
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      "tags": [
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      "tags": [
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary"
    }
  ]
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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