Linux Distros Unpatched Vulnerability : CVE-2026-46223

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

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  script_cve_id("CVE-2026-46223");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-46223");

  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.

  - cgroup: Defer css percpu_ref kill on rmdir until cgroup is depopulated A chain of commits going back to
    v7.0 reworked rmdir to satisfy the controller invariant that a subsystem's ->css_offline() must not run
    while tasks are still doing kernel-side work in the cgroup. [1] d245698d727a (cgroup: Defer task cgroup
    unlink until after the task is done switching out) [2] a72f73c4dd9b (cgroup: Don't expose dead tasks in
    cgroup) [3] 1b164b876c36 (cgroup: Wait for dying tasks to leave on rmdir) [4] 4c56a8ac6869 (cgroup:
    Fix cgroup_drain_dying() testing the wrong condition) [5] 13e786b64bd3 (cgroup: Increment
    nr_dying_subsys_* from rmdir context) [1] moved task cset unlink from do_exit() to finish_task_switch()
    so a task's cset link drops only after the task has fully stopped scheduling. That made tasks past
    exit_signals() linger on cset->tasks until their final context switch, which led to a series of problems
    as what userspace expected to see after rmdir diverged from what the kernel needs to wait for. [2]-[5]
    tried to bridge that divergence: [2] filtered the exiting tasks from cgroup.procs; [3] had rmdir(2) sleep
    in TASK_UNINTERRUPTIBLE for them; [4] fixed the wait's condition; [5] made nr_dying_subsys_* visible
    synchronously. The cgroup_drain_dying() wait in [3] turned out to be a dead end. When the rmdir caller is
    also the reaper of a zombie that pins a pidns teardown (e.g. host PID 1 systemd reaping orphan pids that
    were re-parented to it during the same teardown), rmdir blocks in TASK_UNINTERRUPTIBLE waiting for those
    pids to free, the pids can't free because PID 1 is the reaper and it's stuck in rmdir, and the system A-A
    deadlocks. No internal lock ordering breaks this; the wait itself is the bug. The css killing side that
    drove the original reorder, however, can be made cleanly asynchronous: ->css_offline() is already async,
    run from css_killed_work_fn() driven by percpu_ref_kill_and_confirm(). The fix is to make that chain start
    only after all tasks have left the cgroup. rmdir's user-visible side then returns as soon as cgroup.procs
    and friends are empty, while ->css_offline() still runs only after the cgroup is fully drained. Verified
    by the original reproducer (pidns teardown + zombie reaper, runs under vng) which hangs vanilla and
    succeeds here, and by per-commit deterministic repros for [2], [3], [4], [5] with a boot parameter that
    widens the post-exit_signals() window so each state is reliably reachable. Some stress tests on top of
    that. cgroup_apply_control_disable() has the same shape of pre-existing race: when a controller is
    disabled via subtree_control, kill_css() ran synchronously while tasks past exit_signals() could still be
    linked to the cgroup's csets, and ->css_offline() could fire before they drained. This patch preserves the
    existing synchronous behavior at that call site (kill_css_sync() + kill_css_finish() back-to-back) and a
    follow-up patch will defer kill_css_finish() there using a per-css trigger. This seems like the right
    approach and I don't see problems with it. The changes are somewhat invasive but not excessively so, so
    backporting to -stable should be okay. If something does turn out to be wrong, the fallback is to revert
    the entire chain ([1]-[5]) and rework in the development branch instead. v2: Pin cgrp across the deferred
    destroy work with explicit cgroup_get()/cgroup_put() around queue_work() and the work_fn. v1 wasn't
    actually broken (ordered cgroup_offline_wq + queue_work order in cgroup_task_dead() saved it) but the
    explicit ref removes the dependency on those non-obvious invariants. Also note the pre-existing
    cgroup_apply_control_disable() race in the description; a follow-up will defer kill_css_finish() there.
    (CVE-2026-46223)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  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:N/I:C/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:C/C:N/I:H/A:H");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/28");
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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);

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          {"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-azure-6.11"},
          {"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-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-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-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-6.14"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "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');
}