Linux Distros Unpatched Vulnerability : CVE-2026-27979

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

include('compat.inc');

if (description)
{
  script_id(302933);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/20");

  script_cve_id("CVE-2026-27979");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-27979");

  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.

  - Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and
    prior to version 16.1.7, a request containing the `next-resume: 1` header (corresponding with a PPR resume
    request) would buffer request bodies without consistently enforcing `maxPostponedStateSize` in certain
    setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments
    remained vulnerable to the same unbounded postponed resume-body buffering behavior. In applications using
    the App Router with Partial Prerendering capability enabled (via `experimental.ppr` or `cacheComponents`),
    an attacker could send oversized `next-resume` POST payloads that were buffered without consistent size
    enforcement in non-minimal deployments, causing excessive memory usage and potential denial of service.
    This is fixed in version 16.1.7 by enforcing size limits across all postponed-body buffering paths and
    erroring when limits are exceeded. If upgrading is not immediately possible, block requests containing the
    `next-resume` header, as this is never valid to be sent from an untrusted client. (CVE-2026-27979)

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-2026-27979");
  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:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  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:N/AC:L/AT:N/PR:N/UI:N/VC:N/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-2026-27979");

  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:"2026/03/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:aspnetcore-runtime-7.0");
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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/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/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "aspnetcore-runtime-7.0"},
          {"reference": "aspnetcore-targeting-pack-7.0"},
          {"reference": "dotnet-apphost-pack-7.0"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-7.0"},
          {"reference": "dotnet-runtime-7.0"},
          {"reference": "dotnet-sdk-7.0"},
          {"reference": "dotnet-sdk-7.0-source-built-artifacts"},
          {"reference": "dotnet-targeting-pack-7.0"},
          {"reference": "dotnet-templates-7.0"},
          {"reference": "dotnet7.0"},
          {"reference": "netstandard-targeting-pack-2.1"}
        ]
      }
    ]
  }
};

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