‹ Back to list

CVE-2011-1021

Status: ModifiedLow (3.6)—Exploit
Severity3.6Low · CVSS 2.0
Exploitation probability0.93 %higher than 60% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailablePublished on Exploit-DB

drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347.

CVSS

Base score
3.6
Version
2.0
Vector
AV:L/AC:L/Au:N/C:N/I:P/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.93 %
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 10 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2011-1021",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "LOW",
        "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": "2012-06-21T23:55:01.897",
  "references": [
    {
      "url": "http://ftp.osuosl.org/pub/linux/kernel/v3.0/ChangeLog-3.0",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=526b4af47f44148c9d665e57723ed9f86634c6e3",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2011/02/25/5",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=680841",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://github.com/torvalds/linux/commit/526b4af47f44148c9d665e57723ed9f86634c6e3",
      "tags": [
        "Exploit",
        "Patch"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://ftp.osuosl.org/pub/linux/kernel/v3.0/ChangeLog-3.0",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=526b4af47f44148c9d665e57723ed9f86634c6e3",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2011/02/25/5",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=680841",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/torvalds/linux/commit/526b4af47f44148c9d665e57723ed9f86634c6e3",
      "tags": [
        "Exploit",
        "Patch"
      ],
      "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": "drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347."
    },
    {
      "lang": "es",
      "value": "drivers/acpi/debugfs.c en el kernel de Linux antes de v3.0 permite a usuarios locales modificar posiciones de memoria del kernel de su elección aprovechandose de los privilegios de root para escribir en el archivo /sys/kernel/debug/acpi/custom_method. NOTA: esta vulnerabilidad existe debido a una solución incompleta para el CVE-2010-4347."
    }
  ],
  "lastModified": "2026-06-16T23:28:34.267",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F67EAF8E-BB91-43DF-ACD8-515FC95B0988",
              "versionEndIncluding": "2.6.9"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FC106BDA-2EA4-41A2-AA01-6352A5C255B5"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FB515243-7519-4CA4-9267-D9A6798CBC49"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B672E1B6-E8E9-473F-853F-906EA56D712E"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0EA23C4F-0848-4680-ACB0-CBC57D3F8C5E"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secalert@redhat.com"
}