Linux Distros Unpatched Vulnerability : CVE-2026-81856

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

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  script_cve_id("CVE-2026-81856");

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  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.

  - Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in hexpm hex allows a
    malicious package publisher or a hostile repository server to inject terminal control sequences into the
    output of Mix tasks. Hex prints strings supplied by the package repository and the documentation search
    service straight to the terminal through Hex.Shell.info/1 and Hex.Shell.error/1, neutralizing no control
    characters. Affected sinks span package metadata and configuration snippets in mix hex.info, search
    results in mix hex.package search and mix hex.search, owner and organization listings, publish and sponsor
    URLs, the authenticated username in mix hex.user, policy identities in mix hex.policy, and API error
    bodies rendered by Hex.Utils.print_error_result/1. A malicious package can embed ANSI escape sequences
    (cursor movement, line erase, carriage returns, OSC 52 clipboard writes) or Unicode bidirectional
    overrides in any of those fields, so the bytes reach the terminal unchanged, forging displayed URLs,
    package descriptions and suggested commands, concealing real output, or writing to the clipboard. No
    authentication or privileged position is required; only publishing a package. This issue affects hex: from
    0.0.1 before 2.5.2. (CVE-2026-81856)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-ostree-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-ostree-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-analysis");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-analyzer");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-bootupd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-crypto-auditing-agent");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-crypto-auditing-log-parser");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-debugger-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-gdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-lldb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-src");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-std-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-std-static-aarch64-unknown-none-softfloat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-unknown-unknown");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-wasi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-wasip1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-std-static-x86_64-unknown-none");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-toolset");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rust-toolset-srpm-macros");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rustfmt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-client-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-common-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-common-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-dc-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-dcerpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-gpupdate");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-krb5-printing");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-ldb-ldap-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-pidl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-test-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-usershares");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-vfs-iouring");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winexe");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:sevctl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:snphost");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:stratisd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:stratisd-dracut");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:stratisd-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:system-reinstall-bootc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:thunderbird");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:trustee-guest-components");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:trustee-kbs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:virt-firmware-rs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:wayland-devel");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  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-13", "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", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-26.04");

  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-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "erlang-hex"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "erlang-hex"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "erlang-hex"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "afterburn"},
          {"reference": "afterburn-dracut"},
          {"reference": "bootc"},
          {"reference": "bootupd"},
          {"reference": "cargo"},
          {"reference": "clevis-pin-trustee"},
          {"reference": "clippy"},
          {"reference": "coreos-installer"},
          {"reference": "coreos-installer-bootinfra"},
          {"reference": "coreos-installer-dracut"},
          {"reference": "firefox"},
          {"reference": "glycin-loaders"},
          {"reference": "goose"},
          {"reference": "igvm"},
          {"reference": "keylime-agent-rust"},
          {"reference": "keylime-agent-rust-common"},
          {"reference": "keylime-agent-rust-ima-emulator"},
          {"reference": "keylime-agent-rust-push"},
          {"reference": "ldb-tools"},
          {"reference": "libldb"},
          {"reference": "libldb-devel"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwayland-client"},
          {"reference": "libwayland-cursor"},
          {"reference": "libwayland-egl"},
          {"reference": "libwayland-server"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "loupe"},
          {"reference": "netavark"},
          {"reference": "nmstate"},
          {"reference": "nmstate-devel"},
          {"reference": "nmstate-libs"},
          {"reference": "nmstate-static"},
          {"reference": "papers"},
          {"reference": "papers-devel"},
          {"reference": "papers-libs"},
          {"reference": "papers-nautilus"},
          {"reference": "papers-previewer"},
          {"reference": "papers-thumbnailer"},
          {"reference": "python3-ldb"},
          {"reference": "python3-libnmstate"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-test"},
          {"reference": "rpm-ostree"},
          {"reference": "rpm-ostree-libs"},
          {"reference": "rust"},
          {"reference": "rust-analyzer"},
          {"reference": "rust-crypto-auditing-agent"},
          {"reference": "rust-crypto-auditing-log-parser"},
          {"reference": "rust-debugger-common"},
          {"reference": "rust-doc"},
          {"reference": "rust-gdb"},
          {"reference": "rust-lldb"},
          {"reference": "rust-src"},
          {"reference": "rust-std-static"},
          {"reference": "rust-std-static-aarch64-unknown-none-softfloat"},
          {"reference": "rust-std-static-wasm32-unknown-unknown"},
          {"reference": "rust-std-static-wasm32-wasip1"},
          {"reference": "rust-std-static-x86_64-unknown-none"},
          {"reference": "rust-toolset"},
          {"reference": "rust-toolset-srpm-macros"},
          {"reference": "rustfmt"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-gpupdate"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"},
          {"reference": "sevctl"},
          {"reference": "snphost"},
          {"reference": "stratisd"},
          {"reference": "stratisd-dracut"},
          {"reference": "stratisd-tools"},
          {"reference": "system-reinstall-bootc"},
          {"reference": "thunderbird"},
          {"reference": "trustee-guest-components"},
          {"reference": "trustee-kbs"},
          {"reference": "virt-firmware-rs"},
          {"reference": "wayland-devel"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "firefox"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "firefox"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aardvark-dns"},
          {"reference": "cargo"},
          {"reference": "cargo-doc"},
          {"reference": "clippy"},
          {"reference": "containers-common"},
          {"reference": "firefox"},
          {"reference": "netavark"},
          {"reference": "rls"},
          {"reference": "rpm-ostree"},
          {"reference": "rpm-ostree-libs"},
          {"reference": "rust"},
          {"reference": "rust-analysis"},
          {"reference": "rust-analyzer"},
          {"reference": "rust-debugger-common"},
          {"reference": "rust-doc"},
          {"reference": "rust-gdb"},
          {"reference": "rust-lldb"},
          {"reference": "rust-src"},
          {"reference": "rust-std-static"},
          {"reference": "rust-std-static-wasm32-unknown-unknown"},
          {"reference": "rust-std-static-wasm32-wasi"},
          {"reference": "rust-toolset"},
          {"reference": "rustfmt"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aardvark-dns"},
          {"reference": "cargo"},
          {"reference": "cargo-doc"},
          {"reference": "clippy"},
          {"reference": "containers-common"},
          {"reference": "firefox"},
          {"reference": "netavark"},
          {"reference": "rls"},
          {"reference": "rpm-ostree"},
          {"reference": "rpm-ostree-libs"},
          {"reference": "rust"},
          {"reference": "rust-analysis"},
          {"reference": "rust-analyzer"},
          {"reference": "rust-debugger-common"},
          {"reference": "rust-doc"},
          {"reference": "rust-gdb"},
          {"reference": "rust-lldb"},
          {"reference": "rust-src"},
          {"reference": "rust-std-static"},
          {"reference": "rust-std-static-wasm32-unknown-unknown"},
          {"reference": "rust-std-static-wasm32-wasi"},
          {"reference": "rust-toolset"},
          {"reference": "rustfmt"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "afterburn"},
          {"reference": "afterburn-dracut"},
          {"reference": "bootc"},
          {"reference": "bootupd"},
          {"reference": "cargo"},
          {"reference": "clevis-pin-trustee"},
          {"reference": "clippy"},
          {"reference": "coreos-installer"},
          {"reference": "coreos-installer-bootinfra"},
          {"reference": "coreos-installer-dracut"},
          {"reference": "ctdb"},
          {"reference": "fdo-admin-cli"},
          {"reference": "fdo-client"},
          {"reference": "fdo-init"},
          {"reference": "fdo-manufacturing-server"},
          {"reference": "fdo-owner-cli"},
          {"reference": "fdo-owner-onboarding-server"},
          {"reference": "fdo-rendezvous-server"},
          {"reference": "firefox"},
          {"reference": "firefox-x11"},
          {"reference": "goose"},
          {"reference": "keylime-agent-rust"},
          {"reference": "ldb-tools"},
          {"reference": "libldb"},
          {"reference": "libldb-devel"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "netavark"},
          {"reference": "nmstate"},
          {"reference": "nmstate-devel"},
          {"reference": "nmstate-libs"},
          {"reference": "nmstate-plugin-ovsdb"},
          {"reference": "nmstate-static"},
          {"reference": "python3-ldb"},
          {"reference": "python3-libnmstate"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "rpm-ostree"},
          {"reference": "rpm-ostree-devel"},
          {"reference": "rpm-ostree-libs"},
          {"reference": "rust"},
          {"reference": "rust-analysis"},
          {"reference": "rust-analyzer"},
          {"reference": "rust-bootupd"},
          {"reference": "rust-debugger-common"},
          {"reference": "rust-doc"},
          {"reference": "rust-gdb"},
          {"reference": "rust-lldb"},
          {"reference": "rust-src"},
          {"reference": "rust-std-static"},
          {"reference": "rust-std-static-wasm32-unknown-unknown"},
          {"reference": "rust-std-static-wasm32-wasi"},
          {"reference": "rust-std-static-wasm32-wasip1"},
          {"reference": "rust-toolset"},
          {"reference": "rustfmt"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-gpupdate"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"},
          {"reference": "sevctl"},
          {"reference": "snphost"},
          {"reference": "system-reinstall-bootc"},
          {"reference": "thunderbird"},
          {"reference": "trustee-guest-components"}
        ]
      }
    ]
  }
};

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_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}