Linux Distros Unpatched Vulnerability : CVE-2026-96674

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

include('compat.inc');

if (description)
{
  script_id(349600);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/25");

  script_cve_id("CVE-2026-96674");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-96674");

  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.

  - alsa-lib through 1.2.16.1 computes combined topology element size using 32-bit arithmetic in
    src/topology/ctl.c, allowing integer overflow that defeats bounds checks. Attackers can supply crafted
    topology files that wrap size calculations, causing the decoder to read beyond the topology buffer and
    potentially leak sensitive data or crash the application. (CVE-2026-96674)

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-2026-96674");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-96674");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-96674");
  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:N/AC:M/Au:N/C:P/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-96674");

  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:"2026/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  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");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:alsa-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:alsa-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:alsa-lib-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:alsa-ucm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:alsa-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:alsa-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:alsa-lib-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:alsa-ucm");
  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-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", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "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-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libasound2"},
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"},
          {"reference": "libatopology-dev"},
          {"reference": "libatopology2"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "libasound2"},
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"},
          {"reference": "libatopology-dev"},
          {"reference": "libatopology2"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "libasound2"},
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"},
          {"reference": "libatopology-dev"},
          {"reference": "libatopology2"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"},
          {"reference": "libasound2t64"},
          {"reference": "libatopology-dev"},
          {"reference": "libatopology2t64"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"},
          {"reference": "libasound2t64"},
          {"reference": "libatopology-dev"},
          {"reference": "libatopology2t64"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"},
          {"reference": "libasound2t64"},
          {"reference": "libatopology-dev"},
          {"reference": "libatopology2t64"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"},
          {"reference": "libasound2t64"},
          {"reference": "libatopology-dev"},
          {"reference": "libatopology2t64"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "libasound2"},
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dbg"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-udeb"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "libasound2"},
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dbg"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-udeb"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "libasound2"},
          {"reference": "libasound2-data"},
          {"reference": "libasound2-dev"},
          {"reference": "libasound2-doc"},
          {"reference": "libasound2-plugin-smixer"},
          {"reference": "libasound2-udeb"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "alsa-lib"},
          {"reference": "alsa-lib-devel"},
          {"reference": "alsa-ucm"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "alsa-lib"},
          {"reference": "alsa-lib-devel"},
          {"reference": "alsa-ucm"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "alsa-lib"},
          {"reference": "alsa-lib-devel"},
          {"reference": "alsa-ucm"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "alsa-lib"},
          {"reference": "alsa-lib-devel"},
          {"reference": "alsa-ucm"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "alsa-lib"},
          {"reference": "alsa-lib-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "alsa-lib"},
          {"reference": "alsa-lib-devel"}
        ]
      }
    ]
  }
};

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