Linux Distros Unpatched Vulnerability : CVE-2026-46008

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

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  script_id(318538);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/03");

  script_cve_id("CVE-2026-46008");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-46008");

  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.

  - mm/damon/core: fix damos_walk() vs kdamond_fn() exit race When kdamond_fn() main loop is finished, the
    function cancels remaining damos_walk() request and unset the damon_ctx->kdamond so that API callers and
    API functions themselves can show the context is terminated. damos_walk() adds the caller's request to the
    queue first. After that, it shows if the kdamond of the damon_ctx is still running (damon_ctx->kdamond is
    set). Only if the kdamond is running, damos_walk() starts waiting for the kdamond's handling of the newly
    added request. The damos_walk() requests registration and damon_ctx->kdamond unset are protected by
    different mutexes, though. Hence, damos_walk() could race with damon_ctx->kdamond unset, and result in
    deadlocks. For example, let's suppose kdamond successfully finished the damow_walk() request cancelling.
    Right after that, damos_walk() is called for the context. It registers the new request, and shows the
    context is still running, because damon_ctx->kdamond unset is not yet done. Hence the damos_walk() caller
    starts waiting for the handling of the request. However, the kdamond is already on the termination steps,
    so it never handles the new request. As a result, the damos_walk() caller thread infinitely waits. Fix
    this by introducing another damon_ctx field, namely walk_control_obsolete. It is protected by the
    damon_ctx->walk_control_lock, which protects damos_walk() request registration. Initialize (unset) it in
    kdamond_fn() before letting damon_start() returns and set it just before the cancelling of the remaining
    damos_walk() request is executed. damos_walk() reads the obsolete field under the lock and avoids adding a
    new request. After this change, only requests that are guaranteed to be handled or cancelled are
    registered. Hence the after-registration DAMON context termination check is no longer needed. Remove it
    together. The issue is found by sashiko [1]. (CVE-2026-46008)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-46008");
  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:P/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:L/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:"cvss_score_source", value:"CVE-2026-46008");

  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:"2026/05/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/03");

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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);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
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  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
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        "release": "18.04",
        "pkgs": [
          {"reference": "linux-aws-5.0"},
          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
          {"reference": "linux-azure-edge"},
          {"reference": "linux-azure-headers-4.15.0"},
          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
          {"reference": "linux-gcp-5.3"},
          {"reference": "linux-gcp-headers-4.15.0"},
          {"reference": "linux-gcp-tools-4.15.0"},
          {"reference": "linux-gke-4.15"},
          {"reference": "linux-gke-5.4"},
          {"reference": "linux-gkeop-5.4"},
          {"reference": "linux-headers-4.15.0"},
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          {"reference": "linux-image-4.15.0"},
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          {"reference": "linux-oem-6.1"},
          {"reference": "linux-oem-6.5"},
          {"reference": "linux-oracle-6.5"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-5.19"},
          {"reference": "linux-riscv-6.5"},
          {"reference": "linux-riscv-headers-5.15.0"},
          {"reference": "linux-riscv-tools-5.15.0"},
          {"reference": "linux-starfive-5.19"},
          {"reference": "linux-starfive-6.2"},
          {"reference": "linux-starfive-6.5"},
          {"reference": "linux-tools-5.15.0"},
          {"reference": "linux-tools-5.17.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "linux-aws-6.14"},
          {"reference": "linux-aws-6.17"},
          {"reference": "linux-azure-6.11"},
          {"reference": "linux-azure-6.14"},
          {"reference": "linux-azure-6.17"},
          {"reference": "linux-azure-fde-6.14"},
          {"reference": "linux-azure-fde-6.17"},
          {"reference": "linux-azure-nvidia-6.14"},
          {"reference": "linux-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-gcp-6.11"},
          {"reference": "linux-gcp-6.14"},
          {"reference": "linux-gcp-6.17"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-hwe-6.14"},
          {"reference": "linux-hwe-6.17"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-image-unsigned-6.8.0"},
          {"reference": "linux-lowlatency-hwe-6.11"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-extra-6.8.0"},
          {"reference": "linux-modules-ipu6-6.8.0"},
          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"reference": "linux-nvidia-6.11"},
          {"reference": "linux-nvidia-6.17"},
          {"reference": "linux-oem-6.11"},
          {"reference": "linux-oem-6.14"},
          {"reference": "linux-oem-6.17"},
          {"reference": "linux-oem-6.8-headers-6.8.0"},
          {"reference": "linux-oem-6.8-lib-rust-6.8.0"},
          {"reference": "linux-oem-6.8-tools-6.8.0"},
          {"reference": "linux-oracle-6.14"},
          {"reference": "linux-oracle-6.17"},
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-6.14"},
          {"reference": "linux-riscv-6.17"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "linux-aws-cloud-tools-6.17.0"},
          {"reference": "linux-aws-headers-6.17.0"},
          {"reference": "linux-aws-tools-6.17.0"},
          {"reference": "linux-azure-cloud-tools-6.17.0"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-headers-6.17.0"},
          {"reference": "linux-azure-tools-6.17.0"},
          {"reference": "linux-bpf-dev"},
          {"reference": "linux-buildinfo-6.17.0"},
          {"reference": "linux-cloud-tools-6.17.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-headers-6.17.0"},
          {"reference": "linux-gcp-tools-6.17.0"},
          {"reference": "linux-headers-6.17.0"},
          {"reference": "linux-image-6.17.0"},
          {"reference": "linux-image-unsigned-6.17.0"},
          {"reference": "linux-lib-rust-6.17.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-6.17.0"},
          {"reference": "linux-modules-extra-6.17.0"},
          {"reference": "linux-modules-ipu6-6.17.0"},
          {"reference": "linux-modules-ipu7-6.17.0"},
          {"reference": "linux-modules-iwlwifi-6.17.0"},
          {"reference": "linux-modules-usbio-6.17.0"},
          {"reference": "linux-modules-vision-6.17.0"},
          {"reference": "linux-oracle-headers-6.17.0"},
          {"reference": "linux-oracle-tools-6.17.0"},
          {"reference": "linux-perf"},
          {"reference": "linux-raspi-headers-6.17.0"},
          {"reference": "linux-raspi-tools-6.17.0"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.17.0"},
          {"reference": "linux-riscv-tools-6.17.0"},
          {"reference": "linux-source-6.17.0"},
          {"reference": "linux-tools-6.17.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-aws-64k"},
          {"reference": "linux-udebs-azure"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "linux-aws-cloud-tools-7.0.0"},
          {"reference": "linux-aws-headers-7.0.0"},
          {"reference": "linux-aws-tools-7.0.0"},
          {"reference": "linux-azure-cloud-tools-7.0.0"},
          {"reference": "linux-azure-fde-cloud-tools-7.0.0"},
          {"reference": "linux-azure-fde-headers-7.0.0"},
          {"reference": "linux-azure-fde-tools-7.0.0"},
          {"reference": "linux-azure-headers-7.0.0"},
          {"reference": "linux-azure-tools-7.0.0"},
          {"reference": "linux-bpf-dev"},
          {"reference": "linux-buildinfo-7.0.0"},
          {"reference": "linux-cloud-tools-7.0.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-headers-7.0.0"},
          {"reference": "linux-gcp-tools-7.0.0"},
          {"reference": "linux-headers-7.0.0"},
          {"reference": "linux-ibm-cloud-tools-7.0.0"},
          {"reference": "linux-ibm-headers-7.0.0"},
          {"reference": "linux-ibm-tools-7.0.0"},
          {"reference": "linux-image-7.0.0"},
          {"reference": "linux-image-unsigned-7.0.0"},
          {"reference": "linux-lib-rust-7.0.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-7.0.0"},
          {"reference": "linux-modules-extra-7.0.0"},
          {"reference": "linux-nvidia"},
          {"reference": "linux-oracle-headers-7.0.0"},
          {"reference": "linux-oracle-tools-7.0.0"},
          {"reference": "linux-perf"},
          {"reference": "linux-raspi-headers-7.0.0"},
          {"reference": "linux-raspi-tools-7.0.0"},
          {"reference": "linux-realtime-cloud-tools-7.0.0"},
          {"reference": "linux-realtime-headers-7.0.0"},
          {"reference": "linux-realtime-tools-7.0.0"},
          {"reference": "linux-riscv-headers-7.0.0"},
          {"reference": "linux-riscv-tools-7.0.0"},
          {"reference": "linux-source-7.0.0"},
          {"reference": "linux-tools-7.0.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-aws-64k"},
          {"reference": "linux-udebs-azure"},
          {"reference": "linux-udebs-azure-fde"}
        ]
      }
    ]
  }
};

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');
}