CVE-2026-3184

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3184", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-02-25T08:02:20.937Z", "datePublished": "2026-04-03T18:43:45.725Z", "dateUpdated": "2026-11-06T18:24:19.469Z"}, "containers": {"cna": {"title": "Util-linux: util-linux: access control bypass due to improper hostname canonicalization", "metrics": [{"other": {"content": {"value": "Low", "namespace": "https://access.redhat.com/security/updates/classification/"}, "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"}, "format": "CVSS"}], "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."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "util-linux-main", "defaultStatus": "affected", "versions": [{"version": "2.42-7.1.hum1", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:hummingbird:1"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "util-linux", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:enterprise_linux:10"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "util-linux", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:rhel_els:7"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "util-linux", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:enterprise_linux:8"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "util-linux", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:enterprise_linux:9"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openshift/ose-rhel-coreos-8", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift:4"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openshift/ose-rhel-coreos-9", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift:4"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:7180", "name": "RHSA-2026:7180", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-3184", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442570", "name": "RHBZ#2442570", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-02-25T04:04:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-289", "description": "Authentication Bypass by Alternate Name", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-289: Authentication Bypass by Alternate Name", "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."}], "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."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-06T18:24:19.469Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-03T20:06:07.676542Z", "id": "CVE-2026-3184", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-03T20:06:25.980Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-3184", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-03T20:06:07.676542Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-03T20:06:18.328Z"}}], "cna": {"title": "Util-linux: util-linux: access control bypass due to improper hostname canonicalization", "metrics": [{"other": {"type": "Red Hat severity rating", "content": {"value": "Low", "namespace": "https://access.redhat.com/security/updates/classification/"}}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"cpes": ["cpe:/a:redhat:hummingbird:1"], "vendor": "Red Hat", "product": "Red Hat Hardened Images", "versions": [{"status": "unaffected", "version": "2.42-7.1.hum1", "lessThan": "*", "versionType": "rpm"}], "packageName": "util-linux-main", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:10"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "util-linux", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:rhel_els:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "util-linux", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "util-linux", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "util-linux", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "openshift/ose-rhel-coreos-8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "openshift/ose-rhel-coreos-9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}], "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."}], "datePublic": "2026-02-25T04:04:00.000Z", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:7180", "name": "RHSA-2026:7180", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-3184", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442570", "name": "RHBZ#2442570", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "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"}, "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-289", "description": "Authentication Bypass by Alternate Name"}]}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-06T18:24:19.469Z"}, "x_redhatCweChain": "CWE-289: Authentication Bypass by Alternate Name"}}, "cveMetadata": {"cveId": "CVE-2026-3184", "state": "PUBLISHED", "dateUpdated": "2026-11-06T18:24:19.469Z", "dateReserved": "2026-02-25T08:02:20.937Z", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "datePublished": "2026-04-03T18:43:45.725Z", "assignerShortName": "redhat"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"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:/a: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:rhel_els: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:/a: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:/a: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": "openshift/ose-rhel-coreos-8", "product": "Red Hat OpenShift Container Platform 4", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:openshift:4"], "defaultStatus": "unaffected", "packageName": "openshift/ose-rhel-coreos-9", "product": "Red Hat OpenShift Container Platform 4", "vendor": "Red Hat"}], "source": "secalert@redhat.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:kernel:util-linux:-:*:*:*:*:*:*:*", "matchCriteriaId": "92D87E07-AAB6-4D35-9577-B6E768FEAEAB", "vulnerable": true}, {"criteria": "cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*", "matchCriteriaId": "87DEB507-5B64-47D7-9A50-3B87FD1E571F", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en util-linux. La canonicalizaci\u00f3n incorrecta del nombre de host en la utilidad 'login(1)', cuando se invoca con la opci\u00f3n '-h', puede modificar el nombre de host remoto proporcionado antes de establecer 'PAM_RHOST'. Un atacante remoto podr\u00eda explotar esto al proporcionar un nombre de host especialmente dise\u00f1ado, eludiendo potencialmente las reglas de control de acceso de M\u00f3dulos de Autenticaci\u00f3n Conectables (PAM) basadas en host que dependen de nombres de dominio completamente calificados. Esto podr\u00eda conducir a acceso no autorizado."}], "id": "CVE-2026-3184", "lastModified": "2026-11-06T19:17:49.787", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3184", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-03T20:06:07.676542Z", "version": "2.0.3"}}]}, "published": "2026-04-03T19:17:23.377", "references": [{"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:7180"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-3184"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442570"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-289"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"bugzilla": {"description": "util-linux: util-linux: Access control bypass due to improper hostname canonicalization", "id": "2442570", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442570"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-289", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "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."}, "name": "CVE-2026-3184", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "util-linux", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "util-linux", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "util-linux", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "util-linux", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-02-25T04:04:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-3184\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-3184"], "statement": "This issue was rated as a Low severity issue. This is an authorization policy bypass limited to host-based access control decisions. It does not bypass authentication or grant elevated privileges. Exploitation is configuration-dependent and primarily affects legacy or uncommon remote login pathways, but it can violate administrator intent and weaken PAM-based security policy enforcement.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 70.0, "confidence_source": "inferred", "scores": [{"score": 70.0, "source": "inferred"}, {"score": 86.0, "source": "matching"}]}, "product": "util-linux", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-15T19:41:30.963718+00:00", "value": {"mitigation_remediation": ["Update the system to the vendor\u2011supplied patched util\u2011linux package that fixes the hostname canonicalization bug.", "If the patch cannot be applied immediately, review and tighten PAM host\u2011based access rules so that they rely on explicit FQDNs or other reliable identifiers rather than the value supplied to login's -h option.", "Configure monitoring to detect anomalous authentication attempts that include unexpected or malformed hostnames, and review logs regularly for signs of privilege escalation attempts."], "summary": {"action": "Apply Patch", "impact": "Unauthorized Access via Access Control Bypass"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red Hat products: Red\u202fHat Enterprise\u202fLinux 7 through 10, Red\u202fHat Hardened Images, and Red\u202fHat OpenShift Container Platform\u202f4. Any instance of these operating systems or container runtimes that run login with the -h option is potentially exposed.", "description_and_impact": "A flaw inside the util\u2011linux package, specifically the login utility when run with the -h option, improperly canonicalizes the hostname supplied by the user. The altered hostname is then used to set the PAM_RHOST environment variable, potentially causing host\u2011based Pluggable Authentication Modules to evaluate an incorrect fully qualified domain name. Attackers can craft a hostname that bypasses PAM access control rules, leading to unauthorized authentication or privilege escalation. This weakness is categorized as improper authorization (CWE\u2011289). The impact is limited to gaining authentication privileges; it does not provide arbitrary code execution or denial of service.", "risk_and_exploitability": "The CVSS score of 3.7 indicates a low severity, and the EPSS score is below 1\u202f%, suggesting a very low probability of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog. Since the flaw allows an attacker to influence the hostname used for authentication, the practical attack vector requires remote access to the system to invoke login with the -h option and supply the crafted hostname. No known public exploits exist, so the risk remains low to moderate under current conditions."}}}}, "created": "2026-02-26T13:18:30.680257+00:00", "updated": "2026-04-15T19:45:12.728046+00:00", "vendors": ["linux", "linux$PRODUCT$util-linux"]}