Vulnerability-Lookup

ubuntu-cve-2026-3184

Vulnerability from osv_ubuntu

Published

2026-04-03 19:17

Modified

2026-05-20 15:24

Summary

Details

A flaw was found in util-linux. Improper hostname canonicalization in the login(1) utility, when invoked with the -h option, can modify the supplied remote hostname before setting PAM_RHOST. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access.

Severity

3.7 (Low)


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

5.3 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-3184	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-3184	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "bsdextrautils",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "bsdutils",
            "binary_version": "1:2.41-4ubuntu4.2"
          },
          {
            "binary_name": "eject",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "fdisk",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "lastlog2",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "libblkid1",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "libfdisk1",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "liblastlog2-2",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "libmount1",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "libpam-lastlog2",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "libsmartcols1",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "libuuid1",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "login",
            "binary_version": "1:4.16.0-2+really2.41-4ubuntu4.2"
          },
          {
            "binary_name": "mount",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "rfkill",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "util-linux",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "util-linux-extra",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "util-linux-locales",
            "binary_version": "2.41-4ubuntu4.2"
          },
          {
            "binary_name": "uuid-runtime",
            "binary_version": "2.41-4ubuntu4.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "util-linux",
        "purl": "pkg:deb/ubuntu/util-linux@2.41-4ubuntu4.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.40.2-14ubuntu1",
        "2.41-4ubuntu2",
        "2.41-4ubuntu3",
        "2.41-4ubuntu4",
        "2.41-4ubuntu4.1",
        "2.41-4ubuntu4.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "bsdextrautils",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "bsdutils",
            "binary_version": "1:2.41.3-3ubuntu2"
          },
          {
            "binary_name": "eject",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "fdisk",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "lastlog2",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "libblkid1",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "libfdisk1",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "liblastlog2-2",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "libmount1",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "libpam-lastlog2",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "libsmartcols1",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "libuuid1",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "login",
            "binary_version": "1:4.16.0-2+really2.41.3-3ubuntu2"
          },
          {
            "binary_name": "mount",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "rfkill",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "util-linux",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "util-linux-extra",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "util-linux-locales",
            "binary_version": "2.41.3-3ubuntu2"
          },
          {
            "binary_name": "uuid-runtime",
            "binary_version": "2.41.3-3ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "util-linux",
        "purl": "pkg:deb/ubuntu/util-linux@2.41.3-3ubuntu2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.41-4ubuntu4",
        "2.41.2-4ubuntu1",
        "2.41.2-4ubuntu2",
        "2.41.2-4ubuntu3",
        "2.41.3-3ubuntu1",
        "2.41.3-3ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access.",
  "id": "UBUNTU-CVE-2026-3184",
  "modified": "2026-05-20T15:24:29Z",
  "published": "2026-04-03T19:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-3184"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-3184"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-3184"
  ]
}

CVE-2026-3184 (GCVE-0-2026-3184)

Vulnerability from cvelistv5 – Published: 2026-04-03 18:43 – Updated: 2026-05-01 19:33

Title

Util-linux: util-linux: access control bypass due to improper hostname canonicalization

Summary

A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access.

Severity

3.7 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-289 - Authentication Bypass by Alternate Name

Assigner

redhat

References

3 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:7180	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-3184	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442570	issue-trackingx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 2.42-7.1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-02-25 04:04

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-3184",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-03T20:06:07.676542Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-03T20:06:25.980Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:hummingbird:1"
          ],
          "defaultStatus": "affected",
          "packageName": "util-linux-main",
          "product": "Red Hat Hardened Images",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "2.42-7.1.hum1",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
          ],
          "defaultStatus": "unaffected",
          "packageName": "util-linux",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
          ],
          "defaultStatus": "unaffected",
          "packageName": "util-linux",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "defaultStatus": "unaffected",
          "packageName": "util-linux",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "unaffected",
          "packageName": "util-linux",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
          ],
          "defaultStatus": "unaffected",
          "packageName": "rhcos",
          "product": "Red Hat OpenShift Container Platform 4",
          "vendor": "Red Hat"
        }
      ],
      "datePublic": "2026-02-25T04:04:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://access.redhat.com/security/updates/classification/",
              "value": "Low"
            },
            "type": "Red Hat severity rating"
          }
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "Authentication Bypass by Alternate Name",
              "lang": "en",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-01T19:33:12.808Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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      },
      "references": [
        {
          "name": "RHSA-2026:7180",
          "tags": [
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            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:7180"
        },
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2026-3184"
        },
        {
          "name": "RHBZ#2442570",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442570"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-02-25T07:53:45.502Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2026-02-25T04:04:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Util-linux: util-linux: access control bypass due to improper hostname canonicalization",
      "workarounds": [
        {
          "lang": "en",
          "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-289: Authentication Bypass by Alternate Name"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-3184",
    "datePublished": "2026-04-03T18:43:45.725Z",
    "dateReserved": "2026-02-25T08:02:20.937Z",
    "dateUpdated": "2026-05-01T19:33:12.808Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

ubuntu-cve-2026-3184

Vulnerability from osv_ubuntu

CVE-2026-3184 (GCVE-0-2026-3184)

Tags

Sightings

Nomenclature