Linux Distros Unpatched Vulnerability : CVE-2026-99170

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

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  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/29");

  script_cve_id("CVE-2026-99170");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-99170");

  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.

  - namespace: a mount that copy_tree() leaves out can't take over a lock Since commit c62a4766937e
    (move_mount: transfer MNT_LOCKED) a mount can be moved beneath a locked mount. The lock moves from the
    old cover to the new mount which takes over the job of hiding what's under it and the old cover can be
    unmounted. That works as long as the new mount stays. But the caller picks the new mount and copy_tree()
    leaves a mount of a mount namespace file out of every copy made without CL_COPY_MNT_NS_FILE, together with
    everything mounted on it, and never looks at MNT_LOCKED. unshare(CLONE_NEWNS) and mount propagation make
    such copies. So a task that is root in its own user namespace gets rid of a locked cover on a file without
    a race and without touching the filesystem below it. It makes a child with a mount namespace of its own,
    binds the child's /proc/<pid>/ns/mnt beneath the cover with MOVE_MOUNT_BENEATH, which hands the lock to
    that bind, and calls unshare(CLONE_NEWNS). The new mount namespace has nothing on the file. That's the
    usual way to mask a single file, a bind of /dev/null or of an empty file. With a bind of an ordinary file
    the file stays covered. copy_tree() already refuses to leave out a locked unbindable mount with -EPERM
    since commit df7342b24018 (mount: Don't allow copying MNT_UNBINDABLE|MNT_LOCKED mounts). Do the same for
    a locked mount of a mount namespace file. That also covers a tree copied with CL_COPY_MNT_NS_FILE and
    attached into a mount namespace of another user namespace where lock_mnt_tree() locks it. Note that
    unshare(CLONE_NEWNS) and clone(CLONE_NEWNS) fail with EPERM from such a mount namespace from then on. The
    mount can't be left out and it can't be unmounted. And refuse to move a mount of a mount namespace file
    beneath a locked mount in the first place. Otherwise the task ends up with a mount it can't unmount and an
    unshare() that fails for good. Chris also found a second mount that goes away by itself, a clone of an
    automounted mount that shrink_submounts() took along with its parent. Commit f78ddcc87224 (namespace:
    never expire a locked mount) took care of that one. Chris's reproducer is appended. Mode nsfile reads
    SECRET after the unshare() on 7.3-rc7, with this patch the move_mount() fails with EINVAL and the file
    stays covered. nsfile-control uses an ordinary file and reads MASK both ways. // SPDX-License-Identifier:
    GPL-2.0 /* * Get rid of a locked cover with MOVE_MOUNT_BENEATH. * * The admin (root) makes a tmpfs W: *
    W/D file, holds SECRET, covered by a bind of a file with MASK * W/Dd/inner file, holds SECRET, Dd is
    covered by a bind of a directory * whose inner holds MASK * W/own directory of uid 1000 with the file
    mine and the * directory minedir, whose inner holds MINE * W/dbg debugfs, mode 755. dbg/tracing is
    an automount point * The attacker is uid 1000. It enters a new user namespace with a new mount *
    namespace, so W and both covers are locked there. * * usage: prog MODE * plain put a bind of own/mine
    beneath the cover of D, unmount the cover * nsfile put a bind of the mount namespace file of a child
    beneath the * cover of D, then unshare(CLONE_NEWNS) * nsfile-control the same with a bind of own/mine *
    shrink put a bind of the automounted tracefs beneath the cover of Dd, * unmount the cover, put a tmpfs
    beneath W, call umount(W), which fails * shrink-control the same with a bind of own/minedir * The
    environment variable AUTOMOUNT_DIR names another automount point for shrink. */ #define _GNU_SOURCE
    #include <errno.h> #include <fcntl.h> #include <grp.h> #include <sched.h> #include <signal.h> #include
    <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> ---truncated--- (CVE-2026-99170)

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-2026-99170");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-99170");
  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:M/Au:N/C:C/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:H/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-2026-99170");

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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": [
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        "release": "14",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "hyperv-daemons"},
          {"reference": "intel-sdsi"},
          {"reference": "libcpupower-dev"},
          {"reference": "libcpupower1"},
          {"reference": "linux-base-7.2.12+deb14-alpha-generic"},
          {"reference": "linux-base-7.2.12+deb14-amd64"},
          {"reference": "linux-base-7.2.12+deb14-arm64"},
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          {"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');
}