Linux Distros Unpatched Vulnerability : CVE-2026-97876

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/03");

  script_cve_id("CVE-2026-97876");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-97876");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - A local attacker with control over GRUB's configuration can bypass lockdown restrictions when booting with
    Secure Boot and load an unsigned GRUB module, while GRUB continues to report lockdown is enabled. The
    vulnerability is caused by insufficient validation of the MMIO base address passed to the GRUB serial
    command. GRUB does not validate that the base address corresponds to a UART device, rather than being an
    arbitrary memory address. This allows an attacker to trick GRUB into writing non-arbitrary data at an
    attacker-controlled address, including resetting the grub_file_verifiers list in a way that disables the
    subsequent verification of loaded modules. (CVE-2026-97876)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-97876");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-97876");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-97876");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-aa64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-aa64-cdboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-aa64-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-ia32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-ia32-cdboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-ia32-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-x64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-x64-cdboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-x64-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-pc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-pc-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-ppc-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-ppc64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-ppc64-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-ppc64le");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-ppc64le-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-tools-efi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-tools-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-tools-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:grub2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-cdboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32-cdboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32-modules");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-cdboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-pc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-pc-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-ppc-modules");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-tools-efi");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "grub-common"},
          {"reference": "grub-coreboot"},
          {"reference": "grub-coreboot-bin"},
          {"reference": "grub-coreboot-dbg"},
          {"reference": "grub-efi"},
          {"reference": "grub-efi-amd64"},
          {"reference": "grub-efi-amd64-bin"},
          {"reference": "grub-efi-amd64-dbg"},
          {"reference": "grub-efi-amd64-signed-template"},
          {"reference": "grub-efi-arm"},
          {"reference": "grub-efi-arm-bin"},
          {"reference": "grub-efi-arm-dbg"},
          {"reference": "grub-efi-arm64"},
          {"reference": "grub-efi-arm64-bin"},
          {"reference": "grub-efi-arm64-dbg"},
          {"reference": "grub-efi-arm64-signed-template"},
          {"reference": "grub-efi-ia32"},
          {"reference": "grub-efi-ia32-bin"},
          {"reference": "grub-efi-ia32-dbg"},
          {"reference": "grub-efi-ia32-signed-template"},
          {"reference": "grub-efi-ia64"},
          {"reference": "grub-efi-ia64-bin"},
          {"reference": "grub-efi-ia64-dbg"},
          {"reference": "grub-emu"},
          {"reference": "grub-emu-dbg"},
          {"reference": "grub-firmware-qemu"},
          {"reference": "grub-ieee1275"},
          {"reference": "grub-ieee1275-bin"},
          {"reference": "grub-ieee1275-dbg"},
          {"reference": "grub-linuxbios"},
          {"reference": "grub-mount-udeb"},
          {"reference": "grub-pc"},
          {"reference": "grub-pc-bin"},
          {"reference": "grub-pc-dbg"},
          {"reference": "grub-rescue-pc"},
          {"reference": "grub-theme-starfield"},
          {"reference": "grub-uboot"},
          {"reference": "grub-uboot-bin"},
          {"reference": "grub-uboot-dbg"},
          {"reference": "grub-xen"},
          {"reference": "grub-xen-bin"},
          {"reference": "grub-xen-dbg"},
          {"reference": "grub-xen-host"},
          {"reference": "grub-yeeloong"},
          {"reference": "grub-yeeloong-bin"},
          {"reference": "grub-yeeloong-dbg"},
          {"reference": "grub2"},
          {"reference": "grub2-common"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "grub-common"},
          {"reference": "grub-coreboot"},
          {"reference": "grub-coreboot-bin"},
          {"reference": "grub-coreboot-dbg"},
          {"reference": "grub-efi"},
          {"reference": "grub-efi-amd64"},
          {"reference": "grub-efi-amd64-bin"},
          {"reference": "grub-efi-amd64-dbg"},
          {"reference": "grub-efi-amd64-signed-template"},
          {"reference": "grub-efi-amd64-unsigned"},
          {"reference": "grub-efi-arm"},
          {"reference": "grub-efi-arm-bin"},
          {"reference": "grub-efi-arm-dbg"},
          {"reference": "grub-efi-arm-unsigned"},
          {"reference": "grub-efi-arm64"},
          {"reference": "grub-efi-arm64-bin"},
          {"reference": "grub-efi-arm64-dbg"},
          {"reference": "grub-efi-arm64-signed-template"},
          {"reference": "grub-efi-arm64-unsigned"},
          {"reference": "grub-efi-ia32"},
          {"reference": "grub-efi-ia32-bin"},
          {"reference": "grub-efi-ia32-dbg"},
          {"reference": "grub-efi-ia32-signed-template"},
          {"reference": "grub-efi-ia32-unsigned"},
          {"reference": "grub-efi-loong64"},
          {"reference": "grub-efi-loong64-bin"},
          {"reference": "grub-efi-loong64-dbg"},
          {"reference": "grub-efi-loong64-unsigned"},
          {"reference": "grub-efi-riscv64"},
          {"reference": "grub-efi-riscv64-bin"},
          {"reference": "grub-efi-riscv64-dbg"},
          {"reference": "grub-efi-riscv64-unsigned"},
          {"reference": "grub-emu"},
          {"reference": "grub-emu-dbg"},
          {"reference": "grub-firmware-qemu"},
          {"reference": "grub-ieee1275"},
          {"reference": "grub-ieee1275-bin"},
          {"reference": "grub-ieee1275-dbg"},
          {"reference": "grub-linuxbios"},
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          {"reference": "grub-pc-bin"},
          {"reference": "grub-pc-dbg"},
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          {"reference": "grub-uboot-bin"},
          {"reference": "grub-uboot-dbg"},
          {"reference": "grub-xen"},
          {"reference": "grub-xen-bin"},
          {"reference": "grub-xen-dbg"},
          {"reference": "grub-xen-host"},
          {"reference": "grub2"},
          {"reference": "grub2-common"}
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    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
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          {"reference": "grub-coreboot-dbg"},
          {"reference": "grub-efi"},
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          {"reference": "grub-efi-amd64-bin"},
          {"reference": "grub-efi-amd64-dbg"},
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          {"reference": "grub-efi-arm"},
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          {"reference": "grub-efi-arm-dbg"},
          {"reference": "grub-efi-arm-unsigned"},
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          {"reference": "grub-efi-riscv64-dbg"},
          {"reference": "grub-efi-riscv64-unsigned"},
          {"reference": "grub-emu"},
          {"reference": "grub-emu-dbg"},
          {"reference": "grub-firmware-qemu"},
          {"reference": "grub-ieee1275"},
          {"reference": "grub-ieee1275-bin"},
          {"reference": "grub-ieee1275-dbg"},
          {"reference": "grub-linuxbios"},
          {"reference": "grub-pc"},
          {"reference": "grub-pc-bin"},
          {"reference": "grub-pc-dbg"},
          {"reference": "grub-rescue-pc"},
          {"reference": "grub-uboot"},
          {"reference": "grub-uboot-bin"},
          {"reference": "grub-uboot-dbg"},
          {"reference": "grub-xen-bin"},
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          {"reference": "grub2-common"}
        ]
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    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "grub2"},
          {"reference": "grub2-common"},
          {"reference": "grub2-efi-aa64"},
          {"reference": "grub2-efi-aa64-cdboot"},
          {"reference": "grub2-efi-aa64-modules"},
          {"reference": "grub2-efi-x64"},
          {"reference": "grub2-efi-x64-cdboot"},
          {"reference": "grub2-efi-x64-modules"},
          {"reference": "grub2-pc"},
          {"reference": "grub2-pc-modules"},
          {"reference": "grub2-ppc64le"},
          {"reference": "grub2-ppc64le-modules"},
          {"reference": "grub2-tools"},
          {"reference": "grub2-tools-efi"},
          {"reference": "grub2-tools-extra"},
          {"reference": "grub2-tools-minimal"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "grub2"},
          {"reference": "grub2-common"},
          {"reference": "grub2-efi-aa64"},
          {"reference": "grub2-efi-aa64-cdboot"},
          {"reference": "grub2-efi-aa64-modules"},
          {"reference": "grub2-efi-x64"},
          {"reference": "grub2-efi-x64-cdboot"},
          {"reference": "grub2-efi-x64-modules"},
          {"reference": "grub2-pc"},
          {"reference": "grub2-pc-modules"},
          {"reference": "grub2-ppc64le"},
          {"reference": "grub2-ppc64le-modules"},
          {"reference": "grub2-tools"},
          {"reference": "grub2-tools-efi"},
          {"reference": "grub2-tools-extra"},
          {"reference": "grub2-tools-minimal"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "grub2"},
          {"reference": "grub2-common"},
          {"reference": "grub2-efi"},
          {"reference": "grub2-efi-aa64-modules"},
          {"reference": "grub2-efi-ia32"},
          {"reference": "grub2-efi-ia32-cdboot"},
          {"reference": "grub2-efi-ia32-modules"},
          {"reference": "grub2-efi-modules"},
          {"reference": "grub2-efi-x64"},
          {"reference": "grub2-efi-x64-cdboot"},
          {"reference": "grub2-efi-x64-modules"},
          {"reference": "grub2-pc"},
          {"reference": "grub2-pc-modules"},
          {"reference": "grub2-ppc-modules"},
          {"reference": "grub2-ppc64"},
          {"reference": "grub2-ppc64-modules"},
          {"reference": "grub2-ppc64le"},
          {"reference": "grub2-ppc64le-modules"},
          {"reference": "grub2-tools"},
          {"reference": "grub2-tools-extra"},
          {"reference": "grub2-tools-minimal"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "grub2"},
          {"reference": "grub2-common"},
          {"reference": "grub2-efi"},
          {"reference": "grub2-efi-aa64-modules"},
          {"reference": "grub2-efi-ia32"},
          {"reference": "grub2-efi-ia32-cdboot"},
          {"reference": "grub2-efi-ia32-modules"},
          {"reference": "grub2-efi-modules"},
          {"reference": "grub2-efi-x64"},
          {"reference": "grub2-efi-x64-cdboot"},
          {"reference": "grub2-efi-x64-modules"},
          {"reference": "grub2-pc"},
          {"reference": "grub2-pc-modules"},
          {"reference": "grub2-ppc-modules"},
          {"reference": "grub2-ppc64"},
          {"reference": "grub2-ppc64-modules"},
          {"reference": "grub2-ppc64le"},
          {"reference": "grub2-ppc64le-modules"},
          {"reference": "grub2-tools"},
          {"reference": "grub2-tools-extra"},
          {"reference": "grub2-tools-minimal"}
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      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "grub2"},
          {"reference": "grub2-common"},
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          {"reference": "grub2-efi-aa64-cdboot"},
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          {"reference": "grub2-efi-ia32"},
          {"reference": "grub2-efi-ia32-cdboot"},
          {"reference": "grub2-efi-ia32-modules"},
          {"reference": "grub2-efi-x64"},
          {"reference": "grub2-efi-x64-cdboot"},
          {"reference": "grub2-efi-x64-modules"},
          {"reference": "grub2-pc"},
          {"reference": "grub2-pc-modules"},
          {"reference": "grub2-ppc64le"},
          {"reference": "grub2-ppc64le-modules"},
          {"reference": "grub2-tools"},
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          {"reference": "grub2-tools-extra"},
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      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "grub2"},
          {"reference": "grub2-common"},
          {"reference": "grub2-efi-aa64"},
          {"reference": "grub2-efi-aa64-cdboot"},
          {"reference": "grub2-efi-aa64-modules"},
          {"reference": "grub2-efi-ia32"},
          {"reference": "grub2-efi-ia32-cdboot"},
          {"reference": "grub2-efi-ia32-modules"},
          {"reference": "grub2-efi-x64"},
          {"reference": "grub2-efi-x64-cdboot"},
          {"reference": "grub2-efi-x64-modules"},
          {"reference": "grub2-pc"},
          {"reference": "grub2-pc-modules"},
          {"reference": "grub2-ppc64le"},
          {"reference": "grub2-ppc64le-modules"},
          {"reference": "grub2-tools"},
          {"reference": "grub2-tools-efi"},
          {"reference": "grub2-tools-extra"},
          {"reference": "grub2-tools-minimal"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}