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CVE-2015-6640

Status: ModifiedHigh (7.8)—PoC
Severity7.8High · CVSS 3.0
Exploitation probability0.73 %higher than 53% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailableProof of concept on GitHub (unverified)

The prctl_set_vma_anon_name function in kernel/sys.c in Android before 5.1.1 LMY49F and 6.0 before 2016-01-01 does not ensure that only one vma is accessed in a certain update action, which allows attackers to gain privileges or cause a denial of service (vma list corruption) via a crafted application, aka internal bug 20017123.

CVSS

Base score
7.8
Version
3.0
Vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.73 %
Percentile among all scored CVEs
53
Score date
10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Google — Android

CWEs

References

Show 6 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2015-6640",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 9.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "MEDIUM",
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        "acInsufInfo": false,
        "impactScore": 10,
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        "obtainAllPrivilege": false,
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        "userInteractionRequired": true
      }
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          "attackVector": "LOCAL",
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          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
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        "impactScore": 5.9,
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      }
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  "affected": [
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      "source": "security@android.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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  "published": "2016-01-06T19:59:05.190",
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    {
      "url": "http://source.android.com/security/bulletin/2016-01-01.html",
      "tags": [
        "Vendor Advisory"
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://android.googlesource.com/kernel%2Fcommon/+/69bfe2d957d903521d32324190c2754cb073be15",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-264"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The prctl_set_vma_anon_name function in kernel/sys.c in Android before 5.1.1 LMY49F and 6.0 before 2016-01-01 does not ensure that only one vma is accessed in a certain update action, which allows attackers to gain privileges or cause a denial of service (vma list corruption) via a crafted application, aka internal bug 20017123."
    },
    {
      "lang": "es",
      "value": "La función prctl_set_vma_anon_name en kernel/sys.c en Android en versiones anteriores a 5.1.1 LMY49F y 6.0 en versiones anteriores a 2016-01-01 no asegura que se accede a un solo vma en cierta acción de actualización, lo que permite a atacantes obtener privilegios o causar una denegación de servicio (corrupción de lista vma) a través de una aplicación manipulada, también conocida como error interno 20017123."
    }
  ],
  "lastModified": "2026-06-17T00:31:10.573",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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          "operator": "OR"
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  "sourceIdentifier": "security@android.com"
}