Vulnerability-Lookup

OESA-2022-1536 (CVE-2021-3995)

Vulnerability from osv_openeuler – Published: 2022-02-26 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

util-linux security update

Details

The util-linux package contains a random collection of files that implements some low-level basic linux utilities.

Security Fix(es):

A logical error was found in util-linux's libmount library in a function that allows unprivileged users to unmount FUSE filesystems. Incorrect uid checking allows unprivileged users to unmount FUSE filesystems with similar uid users, an attacker could exploit this vulnerability to cause a denial of service to applications using the affected filesystem.(CVE-2021-3995)

that allows unprivileged users to unmount FUSE filesystems. Issues related to parsing the /proc/self/mountinfo file allow unprivileged users to unmount other users' filesystems that are themselves world-writable (such as /tmp) or mounted in a world-writable directory. An attacker could exploit this vulnerability to cause a denial of service to applications that use the affected file system.(CVE-2021-3996)

Severity

5.5 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3995	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3996	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libblkid-2.35.2-10.oe1.aarch64.rpm",
          "python-libmount-2.35.2-10.oe1.aarch64.rpm",
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          "libfdisk-2.35.2-10.oe1.aarch64.rpm"
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        ]
      },
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      },
      "ranges": [
        {
          "events": [
            {
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            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "libblkid-2.35.2-9.oe1.aarch64.rpm",
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  "database_specific": {
    "severity": "Medium"
  },
  "details": "The util-linux package contains a random collection of files that implements some low-level basic linux utilities.\r\n\r\nSecurity Fix(es):\r\n\r\nA logical error was found in util-linux\u0027s libmount library in a function that allows unprivileged users to unmount FUSE filesystems. Incorrect uid checking allows unprivileged users to unmount FUSE filesystems with similar uid users, an attacker could exploit this vulnerability to cause a denial of service to applications using the affected filesystem.(CVE-2021-3995)\r\n\r\nthat allows unprivileged users to unmount FUSE filesystems. Issues related to parsing the /proc/self/mountinfo file allow unprivileged users to unmount other users\u0027 filesystems that are themselves world-writable (such as /tmp) or mounted in a world-writable directory. An attacker could exploit this vulnerability to cause a denial of service to applications that use the affected file system.(CVE-2021-3996)",
  "id": "OESA-2022-1536",
  "modified": "2026-08-06T11:04:48Z",
  "published": "2022-02-26T11:04:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1536"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3995"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3996"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "util-linux security update",
  "upstream": [
    "CVE-2021-3995",
    "CVE-2021-3996"
  ]
}

CVE-2021-3995 (GCVE-0-2021-3995)

Vulnerability from cvelistv5 – Published: 2022-08-23 00:00 – Updated: 2024-08-03 17:16

Summary

A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.

Severity

No CVSS data available.

CWE

CWE-552 - - Files or Directories Accessible to External Parties

Assigner

redhat redhat root

References

9 references

URL	Tags
https://mirrors.edge.kernel.org/pub/linux/utils/u…
https://www.openwall.com/lists/oss-security/2022/…
https://github.com/util-linux/util-linux/commit/5…
https://bugzilla.redhat.com/show_bug.cgi?id=20246…
http://www.openwall.com/lists/oss-security/2022/11/30/2	mailing-list
http://seclists.org/fulldisclosure/2022/Dec/4	mailing-list
http://packetstormsecurity.com/files/170176/snap-…
https://security.netapp.com/advisory/ntap-2022120…
https://security.gentoo.org/glsa/202401-08	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
n/a	util-linux	Affected: Fixed in util-linux v2.37.3

Show details on NVD website

JSON

To clipboard

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CVE-2021-3996 (GCVE-0-2021-3996)

Vulnerability from cvelistv5 – Published: 2022-08-23 00:00 – Updated: 2024-10-15 15:26

Summary

A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-03-04 21:16 UTC

CWE

CWE-552 - - Files or Directories Accessible to External Parties

Assigner

redhat redhat root

References

10 references

URL	Tags
https://mirrors.edge.kernel.org/pub/linux/utils/u…
https://github.com/util-linux/util-linux/commit/1…
https://www.openwall.com/lists/oss-security/2022/…
https://bugzilla.redhat.com/show_bug.cgi?id=2024628
https://access.redhat.com/security/cve/CVE-2021-3996
http://www.openwall.com/lists/oss-security/2022/11/30/2	mailing-list
http://seclists.org/fulldisclosure/2022/Dec/4	mailing-list
http://packetstormsecurity.com/files/170176/snap-…
https://security.netapp.com/advisory/ntap-2022120…
https://security.gentoo.org/glsa/202401-08	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
n/a	util-linux	Affected: Fixed in util-linux v2.37.3

Show details on NVD website

JSON

To clipboard

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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-03-04T21:16:28.797475Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-15T15:26:56.079Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "util-linux",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "Fixed in util-linux v2.37.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users\u0027 filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-552",
              "description": "CWE-552 - Files or Directories Accessible to External Parties",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-07T09:06:22.825Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "url": "https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes"
        },
        {
          "url": "https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb"
        },
        {
          "url": "https://www.openwall.com/lists/oss-security/2022/01/24/2"
        },
        {
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2024628"
        },
        {
          "url": "https://access.redhat.com/security/cve/CVE-2021-3996"
        },
        {
          "name": "[oss-security] 20221130 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2022/11/30/2"
        },
        {
          "name": "20221208 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)",
          "tags": [
            "mailing-list"
          ],
          "url": "http://seclists.org/fulldisclosure/2022/Dec/4"
        },
        {
          "url": "http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20221209-0002/"
        },
        {
          "name": "GLSA-202401-08",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202401-08"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2021-3996",
    "datePublished": "2022-08-23T00:00:00.000Z",
    "dateReserved": "2021-11-22T00:00:00.000Z",
    "dateUpdated": "2024-10-15T15:26:56.079Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2022-1536 (CVE-2021-3995)

CVE-2021-3995 (GCVE-0-2021-3995)

CVE-2021-3996 (GCVE-0-2021-3996)

Tags

Sightings

Nomenclature

Related by attack behaviour