CVE-2023-21218

Status: ModifiedCritical (9.8)—

In PMRChangeSparseMemOSMem of physmem_osmem_linux.c, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege in the kernel with no additional execution privileges needed. User interaction is not needed for exploitation.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base score: 9.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.41%
Percentile among all scored CVEs: 34
Score date: 10/10/2026

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).

Affected technologies (1)

Google — Android

CWEs

NVD-CWE-noinfo

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2023-21218",
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
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  "published": "2023-12-04T23:15:22.667",
  "references": [
    {
      "url": "https://source.android.com/security/bulletin/2023-12-01",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@android.com"
    },
    {
      "url": "https://source.android.com/security/bulletin/2023-12-01",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "weaknesses": [
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      "description": [
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  "descriptions": [
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    },
    {
      "lang": "es",
      "value": "Hay elevación de privilegios."
    }
  ],
  "lastModified": "2026-06-17T05:32:06.270",
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}