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CVE-2011-1020

Status: ModifiedMedium (4.6)—Exploit
Severity4.6Medium · CVSS 2.0
Exploitation probability0.92 %higher than 60% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailablePublished on Exploit-DB

The proc filesystem implementation in the Linux kernel 2.6.37 and earlier does not restrict access to the /proc directory tree of a process after this process performs an exec of a setuid program, which allows local users to obtain sensitive information or cause a denial of service via open, lseek, read, and write system calls.

CVSS

Base score
4.6
Version
2.0
Vector
AV:L/AC:L/Au:N/C:P/I:P/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.92 %
Percentile among all scored CVEs
60
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.

Affected technologies (1)

Linux — Linux Kernel

CWEs

References

Show 30 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2011-1020",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2011-02-28T16:00:01.930",
  "references": [
    {
      "url": "http://openwall.com/lists/oss-security/2011/02/24/18",
      "tags": [
        "Mailing List",
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    {
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    },
    {
      "url": "http://secunia.com/advisories/43496",
      "tags": [
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
    },
    {
      "url": "http://securityreason.com/securityalert/8107",
      "tags": [
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.halfdog.net/Security/2011/SuidBinariesAndProcInterface/",
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    },
    {
      "url": "http://www.securityfocus.com/bid/46567",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/65693",
      "tags": [
        "Third Party Advisory",
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      "source": "secalert@redhat.com"
    },
    {
      "url": "https://lkml.org/lkml/2011/2/10/21",
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    {
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    {
      "url": "https://lkml.org/lkml/2011/2/9/417",
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    {
      "url": "http://openwall.com/lists/oss-security/2011/02/24/18",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://openwall.com/lists/oss-security/2011/02/25/2",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://seclists.org/fulldisclosure/2011/Jan/421",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://securityreason.com/securityalert/8107",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.halfdog.net/Security/2011/SuidBinariesAndProcInterface/",
      "tags": [
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    },
    {
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    },
    {
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    },
    {
      "url": "https://lkml.org/lkml/2011/2/9/417",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The proc filesystem implementation in the Linux kernel 2.6.37 and earlier does not restrict access to the /proc directory tree of a process after this process performs an exec of a setuid program, which allows local users to obtain sensitive information or cause a denial of service via open, lseek, read, and write system calls."
    },
    {
      "lang": "es",
      "value": "La implementación del sistema de ficheros proc en el Kernel de Linux v2.6.37 y anteriores no restringe el acceso a un proceso del árbol del directorio /proc después de realizar este un proceso exec en un programa setuid, permite a usuarios locales obtener información sensible o provocar una denegación de servicio a través de llamadas open, lseek, read y write al sistema."
    }
  ],
  "lastModified": "2026-06-16T23:28:34.133",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "76630B45-B590-4651-972E-F938A83010C0",
              "versionEndExcluding": "2.6.37"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secalert@redhat.com"
}