Linux Distros Unpatched Vulnerability : CVE-2026-31733

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

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  script_id(312208);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/29");

  script_cve_id("CVE-2026-31733");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-31733");

  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.

  - sched_ext: Fix stale direct dispatch state in ddsp_dsq_id @p->scx.ddsp_dsq_id can be left set (non-
    SCX_DSQ_INVALID) triggering a spurious warning in mark_direct_dispatch() when the next wakeup's
    ops.select_cpu() calls scx_bpf_dsq_insert(), such as: WARNING: kernel/sched/ext.c:1273 at
    scx_dsq_insert_commit+0xcd/0x140 The root cause is that ddsp_dsq_id was only cleared in
    dispatch_enqueue(), which is not reached in all paths that consume or cancel a direct dispatch verdict.
    Fix it by clearing it at the right places: - direct_dispatch(): cache the direct dispatch state in local
    variables and clear it before dispatch_enqueue() on the synchronous path. For the deferred path, the
    direct dispatch state must remain set until process_ddsp_deferred_locals() consumes them. -
    process_ddsp_deferred_locals(): cache the dispatch state in local variables and clear it before calling
    dispatch_to_local_dsq(), which may migrate the task to another rq. - do_enqueue_task(): clear the dispatch
    state on the enqueue path (local/global/bypass fallbacks), where the direct dispatch verdict is ignored. -
    dequeue_task_scx(): clear the dispatch state after dispatch_dequeue() to handle both the deferred dispatch
    cancellation and the holding_cpu race, covering all cases where a pending direct dispatch is cancelled. -
    scx_disable_task(): clear the direct dispatch state when transitioning a task out of the current
    scheduler. Waking tasks may have had the direct dispatch state set by the outgoing scheduler's
    ops.select_cpu() and then been queued on a wake_list via ttwu_queue_wakelist(), when
    SCX_OPS_ALLOW_QUEUED_WAKEUP is set. Such tasks are not on the runqueue and are not iterated by
    scx_bypass(), so their direct dispatch state won't be cleared. Without this clear, any subsequent SCX
    scheduler that tries to direct dispatch the task will trigger the WARN_ON_ONCE() in
    mark_direct_dispatch(). (CVE-2026-31733)

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-2026-31733");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/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-2026-31733");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-31733");

  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:"2026/05/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/05");

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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": [
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          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
          {"reference": "linux-azure-edge"},
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          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
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          {"reference": "linux-gcp-headers-4.15.0"},
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          {"reference": "linux-gke-5.4"},
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          {"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": "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-buildinfo-7.0.0"},
          {"reference": "linux-cloud-tools-7.0.0"},
          {"reference": "linux-headers-7.0.0"},
          {"reference": "linux-image-unsigned-7.0.0"},
          {"reference": "linux-lib-rust-7.0.0"},
          {"reference": "linux-modules-7.0.0"},
          {"reference": "linux-tools-7.0.0"},
          {"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');
}