Linux Distros Unpatched Vulnerability : CVE-2026-99253

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

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  script_id(375582);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/07");

  script_cve_id("CVE-2026-99253");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-99253");

  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.

  - io_uring/cancel: rearm local work wake up before sleep io_uring_try_cancel_requests() sets ->cq_wait_nr to
    1 so that the next io_req_local_work_add() wakes the cancelling task. The add that takes the count to zero
    is the only one that wakes, later ones see a count <= 0 and return. io_uring_cancel_generic() however only
    becomes TASK_INTERRUPTIBLE much later, so the one wake up can be spent on a running task. That is fine as
    long as the entry of that add is still queued, as the io_local_work_pending() check then skips the sleep.
    It is not if the add was delayed after queueing its entry: CPU0 (submitter in exec or exit) CPU1
    (io_req_local_work_add) mpscq_push(req A) io_uring_try_cancel_requests() io_run_local_work() // runs req A
    io_uring_try_cancel_requests() atomic_set(&ctx->cq_wait_nr, 1) atomic_read(&ctx->cq_wait_nr) == 1 count
    taken, wake_up_state() // task is running, no-op prepare_to_wait(TASK_INTERRUPTIBLE)
    io_local_work_pending() == false schedule() mpscq_push(req B) cq_wait_nr <= 0, return Only the sleeping
    task can run req B, so it is stuck in execve() until a signal happens to wake it. An exiting task doesn't
    even get that. Arm the count again once the task state is set and before the work list is checked, for the
    rings whose local work this task is the one to run. (CVE-2026-99253)

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-2026-99253");
  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:L/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:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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-2026-99253");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/11/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/03");

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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": [
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        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
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          {"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-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-6.8-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-26.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.10",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "linux-aws-cloud-tools-7.3.0"},
          {"reference": "linux-aws-headers-7.3.0"},
          {"reference": "linux-aws-tools-7.3.0"},
          {"reference": "linux-azure-cloud-tools-7.3.0"},
          {"reference": "linux-azure-fde-cloud-tools-7.3.0"},
          {"reference": "linux-azure-fde-headers-7.3.0"},
          {"reference": "linux-azure-fde-tools-7.3.0"},
          {"reference": "linux-azure-headers-7.3.0"},
          {"reference": "linux-azure-tools-7.3.0"},
          {"reference": "linux-bpf-dev"},
          {"reference": "linux-buildinfo-7.3.0"},
          {"reference": "linux-cloud-tools-7.3.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-headers-7.3.0"},
          {"reference": "linux-gcp-tools-7.3.0"},
          {"reference": "linux-headers-7.3.0"},
          {"reference": "linux-image-7.3.0"},
          {"reference": "linux-image-unsigned-7.3.0"},
          {"reference": "linux-lib-rust-7.3.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-7.3.0"},
          {"reference": "linux-modules-extra-7.3.0"},
          {"reference": "linux-oracle-headers-7.3.0"},
          {"reference": "linux-oracle-tools-7.3.0"},
          {"reference": "linux-perf"},
          {"reference": "linux-raspi-headers-7.3.0"},
          {"reference": "linux-raspi-tools-7.3.0"},
          {"reference": "linux-realtime-cloud-tools-7.3.0"},
          {"reference": "linux-realtime-headers-7.3.0"},
          {"reference": "linux-realtime-tools-7.3.0"},
          {"reference": "linux-riscv-headers-7.3.0"},
          {"reference": "linux-riscv-tools-7.3.0"},
          {"reference": "linux-source-7.3.0"},
          {"reference": "linux-tools-7.3.0"},
          {"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 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');
}