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Linux Distros Unpatched Vulnerability : CVE-2026-99207

🗓️ 28 Oct 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

scsi target_do_delayed_work() uses spin_lock() instead of spin_lock_irqsave() causing DoS.

Related
Refs
Code
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-99207
28 Oct 202611:55
–circl
cve
CVE
CVE-2026-99207
28 Oct 202610:36
–cve
cvelist
Cvelist
CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock
28 Oct 202610:36
–cvelist
debiancve
Debian CVE
CVE-2026-99207
28 Oct 202618:47
–debiancve
euvd
EUVD
EUVD-2026-111959
28 Oct 202610:36
–euvd
nvd
NVD
CVE-2026-99207
28 Oct 202611:17
–nvd
osv_bell
osv_bell
BELL-CVE-2026-99207 CVE-2026-99207 does not affect BellSoft software
30 Oct 202606:06
–osv_bell
osv_cve
osv_cve
CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock
28 Oct 202610:36
–osv_cve
osv_debian
osv_debian
DEBIAN-CVE-2026-99207
28 Oct 202611:17
–osv_debian
osv_ubuntu
osv_ubuntu
UBUNTU-CVE-2026-99207
28 Oct 202600:00
–osv_ubuntu
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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patched.");
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"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - scsi: target: Disable interrupts while holding delayed_cmd_lock target_do_delayed_work() takes
    dev->delayed_cmd_lock with a plain spin_lock(). It runs from system_percpu_wq, so interrupts stay enabled
    while the lock is held. Every other acquisition of that lock uses spin_lock_irqsave():
    target_handle_task_attr() and transport_complete_ordered_sync() in target_core_transport.c, and
    target_non_ordered_release() in target_core_device.c. That was safe while every caller of
    transport_complete_task_attr() ran in process context: target_complete_ok_work() from
    target_completion_wq, transport_complete_qf() from dev->qf_work_queue, and
    transport_generic_request_failure() from the submit and execute paths. Since commit 06933066d88a (scsi:
    target: Add support for completing commands from backend context) that is no longer true. With
    complete_type=1 on a fabric that sets direct_compl_supp, target_complete() runs target_complete_ok_work()
    inline in the backend's completion context, which target_complete_cmd_with_sense() documents as May be
    called from interrupt context. For iblock that is the bio end_io. target_complete_ok_work() starts with
    transport_complete_task_attr(), which takes delayed_cmd_lock in two ways: - Every ORDERED command is put
    on dev->delayed_cmd_list by target_handle_task_attr() and dispatched from there by
    target_do_delayed_work(), which marks it SCF_TASK_ORDERED_SYNC. Its completion therefore goes through
    transport_complete_ordered_sync(). - A SIMPLE command that completes while an ORDERED command is pending
    drops the last reference to the killed dev->non_ordered, and percpu_ref_put() then runs
    target_non_ordered_release() in the completing context. Both take the lock and, if commands are waiting,
    call schedule_work(&dev->delayed_cmd_work), which queues on system_percpu_wq, i.e. on the CPU that took
    the completion. Further completions for the same queue are typically delivered there too, so one arriving
    while the work holds the lock spins on it forever. Reaching this needs complete_type=1, which is not the
    default (vhost-scsi, the only fabric with direct_compl_supp, defaults to TARGET_QUEUE_COMPL), a backend
    whose I/O completes from interrupt context, and ORDERED commands from the initiator. Linux virtio_scsi
    guests send only VIRTIO_SCSI_S_SIMPLE and never take the ordered path; any guest that uses the ORDERED
    task attribute, which vhost-scsi accepts, does. target_do_delayed_work() is a work item and always runs in
    process context, so spin_lock_irq() is sufficient. Found by inspection; no runtime report. A single
    ORDERED command goes through both acquisitions, so with CONFIG_PROVE_LOCKING the first one completed
    through direct completion should produce an inconsistent lock state report on delayed_cmd_lock (hardirq or
    softirq, depending on where the backend completes). (CVE-2026-99207)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-99207");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-99207");
  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");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
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  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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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');

var distro_constraints_array = {
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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
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          {"reference": "intel-sdsi"},
          {"reference": "libcpupower-dev"},
          {"reference": "libcpupower1"},
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          {"reference": "linux-azure-5.13"},
          {"reference": "linux-azure-5.8"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-buildinfo-5.4.0"},
          {"reference": "linux-buildinfo-5.6.0"},
          {"reference": "linux-cloud-tools-5.4.0"},
          {"reference": "linux-cloud-tools-5.6.0"},
          {"reference": "linux-gcp-5.11"},
          {"reference": "linux-gcp-5.13"},
          {"reference": "linux-gcp-5.8"},
          {"reference": "linux-gke"},
          {"reference": "linux-gke-5.15"},
          {"reference": "linux-gkeop"},
          {"reference": "linux-gkeop-5.15"},
          {"reference": "linux-headers-5.4.0"},
          {"reference": "linux-headers-5.6.0"},
          {"reference": "linux-hwe-5.11"},
          {"reference": "linux-hwe-5.13"},
          {"reference": "linux-hwe-5.8"},
          {"reference": "linux-image-5.4.0"},
          {"reference": "linux-image-unsigned-5.6.0"},
          {"reference": "linux-intel-5.13"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-5.4.0"},
          {"reference": "linux-modules-5.6.0"},
          {"reference": "linux-modules-extra-5.4.0"},
          {"reference": "linux-modules-extra-5.6.0"},
          {"reference": "linux-oem-5.10"},
          {"reference": "linux-oem-5.13"},
          {"reference": "linux-oem-5.14"},
          {"reference": "linux-oem-5.6-headers-5.6.0"},
          {"reference": "linux-oem-5.6-tools-5.6.0"},
          {"reference": "linux-oem-5.6-tools-common"},
          {"reference": "linux-oem-5.6-tools-host"},
          {"reference": "linux-oracle-5.11"},
          {"reference": "linux-oracle-5.13"},
          {"reference": "linux-oracle-5.8"},
          {"reference": "linux-raspi2"},
          {"reference": "linux-riscv-5.11"},
          {"reference": "linux-riscv-5.8"},
          {"reference": "linux-riscv-headers-5.4.0"},
          {"reference": "linux-riscv-tools-5.4.0"},
          {"reference": "linux-tools-5.4.0"},
          {"reference": "linux-tools-5.6.0"},
          {"reference": "linux-udebs-generic"},
          {"reference": "linux-udebs-oem"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "linux-allwinner-5.19"},
          {"reference": "linux-aws-5.19"},
          {"reference": "linux-aws-6.2"},
          {"reference": "linux-aws-6.5"},
          {"reference": "linux-azure-5.19"},
          {"reference": "linux-azure-6.2"},
          {"reference": "linux-azure-6.5"},
          {"reference": "linux-azure-fde-5.19"},
          {"reference": "linux-azure-fde-6.2"},
          {"reference": "linux-buildinfo-5.15.0"},
          {"reference": "linux-buildinfo-5.17.0"},
          {"reference": "linux-cloud-tools-5.15.0"},
          {"reference": "linux-cloud-tools-5.17.0"},
          {"reference": "linux-gcp-5.19"},
          {"reference": "linux-gcp-6.2"},
          {"reference": "linux-gcp-6.5"},
          {"reference": "linux-headers-5.15.0"},
          {"reference": "linux-headers-5.17.0"},
          {"reference": "linux-hwe-5.19"},
          {"reference": "linux-hwe-6.2"},
          {"reference": "linux-hwe-6.5"},
          {"reference": "linux-image-5.15.0"},
          {"reference": "linux-image-unsigned-5.17.0"},
          {"reference": "linux-intel-iot-realtime"},
          {"reference": "linux-lowlatency-hwe-5.19"},
          {"reference": "linux-lowlatency-hwe-6.2"},
          {"reference": "linux-lowlatency-hwe-6.5"},
          {"reference": "linux-modules-5.15.0"},
          {"reference": "linux-modules-5.17.0"},
          {"reference": "linux-modules-extra-5.15.0"},
          {"reference": "linux-modules-extra-5.17.0"},
          {"reference": "linux-nvidia-6.2"},
          {"reference": "linux-nvidia-6.5"},
          {"reference": "linux-oem-5.17-headers-5.17.0"},
          {"reference": "linux-oem-5.17-tools-5.17.0"},
          {"reference": "linux-oem-5.17-tools-host"},
          {"reference": "linux-oem-6.0"},
          {"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-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');
}

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29 Oct 2026 00:00Current
6.2Medium risk
Vulners AI Score6.2
EPSS0.00145
4