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Linux Distros Unpatched Vulnerability : CVE-2026-98865

🗓️ 20 Oct 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

Self-deadlock in sched_ext when a BPF scheduler locks the source user DSQ.

Related
Refs
Code
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-98865
18 Oct 202617:48
–circl
cnnvd
CNNVD
Linux Kernel Security Vulnerabilities
17 Oct 202616:00
–cnnvd
cve
CVE
CVE-2026-98865
18 Oct 202615:51
–cve
cvelist
Cvelist
CVE-2026-98865 sched_ext: Don't run ops.dequeue() with a DSQ lock held
18 Oct 202615:51
–cvelist
debiancve
Debian CVE
CVE-2026-98865
18 Oct 202615:51
–debiancve
euvd
EUVD
EUVD-2026-103805
18 Oct 202615:51
–euvd
nvd
NVD
CVE-2026-98865
18 Oct 202616:17
–nvd
osv_bell
osv_bell
BELL-CVE-2026-98865 CVE-2026-98865 does not affect BellSoft software
21 Oct 202606:10
–osv_bell
osv_debian
osv_debian
DEBIAN-CVE-2026-98865
18 Oct 202616:17
–osv_debian
osv_ubuntu
osv_ubuntu
UBUNTU-CVE-2026-98865
19 Oct 202600:00
–osv_ubuntu
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
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  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-98865");

  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.

  - In the Linux kernel, the following vulnerability has been resolved: sched_ext: Don't run ops.dequeue()
    with a DSQ lock held ops.dequeue() is invoked with the source user DSQ's lock still held on the consume
    and move paths (scx_consume_dispatch_q(), move_task_between_dsqs()). A BPF scheduler which locks the
    source user DSQ from ops.dequeue() - e.g. by iterating it with bpf_iter_scx_dsq - self-deadlocks.
    ops.dequeue() can only call the any kfuncs and none of them can lock a builtin DSQ, so the global and
    bypass paths can't deadlock; however, all DSQ locks share one lockdep class, so iterating any user DSQ
    from ops.dequeue() on those paths trips the recursion check. Move the invocation after the DSQ unlock on
    all three paths. SCX_TASK_IN_CUSTODY is cleared under the lock serializing the transfer so that the
    callback is invoked exactly once. (CVE-2026-98865)

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-2026-98865");
  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: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:N/A:H");
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  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-98865");

  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:"2026/10/18");
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  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  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/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04");

  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/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": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
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  "Ubuntu Linux-18.04": {
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        "release": "18.04",
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          {"reference": "linux-aws-5.3"},
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          {"reference": "linux-azure-cloud-tools-4.15.0"},
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          {"reference": "linux-oracle-5.3"},
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          {"reference": "linux-udebs-azure"},
          {"reference": "linux-udebs-oem"}
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  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
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          {"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"}
        ]
      }
    ]
  }
};

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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21 Oct 2026 00:00Current
6.1Medium risk
Vulners AI Score6.1
EPSS0.00168
4