CVE-2026-6245

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Un atacante local podr\u00eda potencialmente activar esta vulnerabilidad al iniciar una solicitud de autenticaci\u00f3n de clave de paso manipulada, lo que provoca que el respondedor PAM de SSSD falle, lo que resulta en una denegaci\u00f3n de servicio (DoS) local."}], "id": "CVE-2026-6245", "lastModified": "2026-11-10T19:21:20.093", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6245", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-15T19:36:34.863173Z", "version": "2.0.3"}}]}, "published": "2026-04-15T19:16:38.250", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:97077"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:97438"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-6245"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457954"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-805"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"bugzilla": {"description": "sssd: out-of-bounds read in the sssd", "id": "2457954", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457954"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-805", "details": ["A flaw was found in the System Security Services Daemon (SSSD). The pam_passkey_child_read_data() function within the PAM passkey responder fails to properly handle raw bytes received from a pipe. Because the data is treated as a NUL-terminated C string without explicit termination, it results in an out-of-bounds read when processed by functions like snprintf(). A local attacker could potentially trigger this vulnerability by initiating a crafted passkey authentication request, causing the SSSD PAM responder to crash, resulting in a local Denial of Service (DoS)."], "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-2026-6245", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "sssd", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-15T18:20:05Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-6245\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6245"], "statement": "This Moderate impact flaw in the System Security Services Daemon (SSSD) can lead to a local Denial of Service. A local attacker can exploit an out-of-bounds read in the PAM passkey responder by sending a crafted authentication request, causing the SSSD service to crash. This affects Red Hat systems where SSSD is configured and local user access is possible.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat Enterprise Linux 10", "source": "cna", "vendor": "Red Hat"}, "product": "enterprise_linux", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Red Hat OpenShift Container Platform 4", "source": "cna", "vendor": "Red Hat"}, "product": "openshift_container_platform", "vendor": "redhat"}], "analysis": {"en": {"generated_at": "2026-04-15T22:12:19.962086+00:00", "value": {"mitigation_remediation": ["Apply the Red\u202fHat update that corrects the SSSD PAM responder when it becomes available.", "If a patch cannot be applied immediately, remove or disable the passkey authentication module from the PAM configuration on affected systems to block the attack vector.", "Restrict local accounts that can invoke the PAM passkey responder by applying least\u2011privilege policies so that only trusted users are allowed to initiate passkey authentication."], "summary": {"action": "Monitor", "impact": "Local Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red\u202fHat Enterprise Linux\u202f10,\u202f6,\u202f7,\u202f8,\u202f9 and Red\u202fHat OpenShift Container Platform\u202f4, specifically systems that have the PAM passkey authentication module enabled.", "description_and_impact": "A flaw in the System Security Services Daemon (SSSD) causes an out\u2011of\u2011bounds read when pam_passkey_child_read_data() processes raw bytes from a pipe as a NUL\u2011terminated C string. The missing explicit termination leads to a crash when functions such as snprintf() read past the buffer end, allowing a local attacker to trigger a passkey authentication request that crashes the PAM responder and results in a denial of service.", "risk_and_exploitability": "With a CVSS score of 5.5 the severity is moderate. Exploitation requires local access to craft a passkey request; no publicly available exploit code is known and the EPSS score is not available. The vulnerability is not listed in the CISA KEV catalog, suggesting a low to moderate likelihood of exploitation in the wild, but any local attacker could cause service disruption."}}}}, "created": "2026-04-15T22:15:15.710854+00:00", "updated": "2026-04-16T09:12:25.846225+00:00", "vendors": ["redhat", "redhat$PRODUCT$enterprise_linux", "redhat$PRODUCT$openshift_container_platform"]}