Linux Distros Unpatched Vulnerability : CVE-2026-27456

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

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  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/30");

  script_cve_id("CVE-2026-27456");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-27456");

  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.

  - util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-
    Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The
    mount binary, when setting up loop devices, validates the source file path with user privileges via fork()
    + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0)
    without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor
    inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the
    source file with a symlink pointing to any root-owned file or device during the race window, causing the
    SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options
    whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the
    SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized
    read access to root-protected files and block devices, including backup images, disk volumes, and any file
    containing a valid filesystem. This issue has been patched in version 2.41.4. (CVE-2026-27456)

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-2026-27456");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-27456");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-27456");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
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  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N");
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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);
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          {"reference": "libblkid-devel"},
          {"reference": "libfdisk"},
          {"reference": "libfdisk-devel"},
          {"reference": "libmount"},
          {"reference": "libmount-devel"},
          {"reference": "libsmartcols"},
          {"reference": "libsmartcols-devel"},
          {"reference": "libuuid"},
          {"reference": "libuuid-devel"},
          {"reference": "python3-libmount"},
          {"reference": "util-linux"},
          {"reference": "util-linux-user"},
          {"reference": "uuidd"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "libblkid"},
          {"reference": "libblkid-devel"},
          {"reference": "libfdisk"},
          {"reference": "libfdisk-devel"},
          {"reference": "libmount"},
          {"reference": "libmount-devel"},
          {"reference": "libsmartcols"},
          {"reference": "libsmartcols-devel"},
          {"reference": "libuuid"},
          {"reference": "libuuid-devel"},
          {"reference": "python3-libmount"},
          {"reference": "util-linux"},
          {"reference": "util-linux-core"},
          {"reference": "util-linux-user"},
          {"reference": "uuidd"}
        ]
      }
    ]
  }
};

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 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');
}