{
    "id": "CVE-2023-4911",
    "published": "2023-10-03 18:15:10",
    "last_modified": "2026-06-17 06:38:52",
    "cvss_score": "7.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-122",
    "description": "A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.",
    "epss_score": "0.81422",
    "epss_percentile": "0.99630",
    "kev": 1,
    "kev_due": "2023-12-12",
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:32:46",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2023-12-12."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "fedoraproject",
            "product": "fedora"
        },
        {
            "vendor": "gnu",
            "product": "glibc"
        },
        {
            "vendor": "netapp",
            "product": "bootstrap_os"
        },
        {
            "vendor": "netapp",
            "product": "h410c"
        },
        {
            "vendor": "netapp",
            "product": "h410c_firmware"
        },
        {
            "vendor": "netapp",
            "product": "hci_compute_node"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder_eus"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder_for_arm64"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder_for_arm64_eus"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder_for_ibm_z_systems"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder_for_ibm_z_systems_eus"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder_for_power_little_endian"
        },
        {
            "vendor": "redhat",
            "product": "codeready_linux_builder_for_power_little_endian_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_arm_64"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_arm_64_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_ibm_z_systems"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_ibm_z_systems_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_ibm_z_systems_eus_s390x"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_power_big_endian_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_power_little_endian"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_for_power_little_endian_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_aus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_tus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_update_services_for_sap_solutions"
        },
        {
            "vendor": "redhat",
            "product": "virtualization"
        },
        {
            "vendor": "redhat",
            "product": "virtualization_host"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518-4_pn\\/dp_mfp"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518-4_pn\\/dp_mfp_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518f-4_pn\\/dp_mfp"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518f-4_pn\\/dp_mfp_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_tm_mfp"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_tm_mfp_firmware"
        },
        {
            "vendor": "siemens",
            "product": "siplus_s7-1500_cpu_1518-4_pn\\/dp_mfp"
        },
        {
            "vendor": "siemens",
            "product": "siplus_s7-1500_cpu_1518-4_pn\\/dp_mfp_firmware"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2023-4911",
        "date_added": "2023-11-21",
        "due_date": "2023-12-12",
        "vendor": "GNU",
        "product": "GNU C Library",
        "name": "GNU C Library Buffer Overflow Vulnerability",
        "ransomware": 0
    },
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "52479",
            "title": "glibc 2.38 - Buffer Overflow",
            "date": "2026-02-11",
            "url": "https://www.exploit-db.com/exploits/52479"
        }
    ],
    "refs_list": [
        "https://access.redhat.com/errata/RHSA-2023:5453",
        "https://access.redhat.com/errata/RHSA-2023:5454",
        "https://access.redhat.com/errata/RHSA-2023:5455",
        "https://access.redhat.com/errata/RHSA-2023:5476",
        "https://access.redhat.com/errata/RHSA-2024:0033",
        "https://access.redhat.com/security/cve/CVE-2023-4911",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2238352",
        "https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt",
        "https://www.qualys.com/cve-2023-4911/",
        "http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html",
        "http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html",
        "http://seclists.org/fulldisclosure/2023/Oct/11",
        "http://www.openwall.com/lists/oss-security/2023/10/03/2",
        "http://www.openwall.com/lists/oss-security/2023/10/03/3",
        "http://www.openwall.com/lists/oss-security/2023/10/05/1",
        "http://www.openwall.com/lists/oss-security/2023/10/13/11",
        "http://www.openwall.com/lists/oss-security/2023/10/14/3",
        "http://www.openwall.com/lists/oss-security/2023/10/14/5",
        "http://www.openwall.com/lists/oss-security/2023/10/14/6",
        "https://access.redhat.com/errata/RHSA-2023:5453",
        "https://access.redhat.com/errata/RHSA-2023:5454",
        "https://access.redhat.com/errata/RHSA-2023:5455",
        "https://access.redhat.com/errata/RHSA-2023:5476",
        "https://access.redhat.com/errata/RHSA-2024:0033",
        "https://access.redhat.com/security/cve/CVE-2023-4911"
    ]
}