Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-107329)

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

include('compat.inc');

if (description)
{
  script_id(344927);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/11");

  script_cve_id("CVE-2024-56770");

  script_name(english:"Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-107329)");

  script_set_attribute(attribute:"synopsis", value:
"The Unity Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the
UTSA-2026-107329 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    net/sched: netem: account for backlog updates from child qdisc

    In general, 'qlen' of any classful qdisc should keep track of the
    number of packets that the qdisc itself and all of its children holds.
    In case of netem, 'qlen' only accounts for the packets in its internal
    tfifo. When netem is used with a child qdisc, the child qdisc can use
    'qdisc_tree_reduce_backlog' to inform its parent, netem, about created
    or dropped SKBs. This function updates 'qlen' and the backlog statistics
    of netem, but netem does not account for changes made by a child qdisc.
    'qlen' then indicates the wrong number of packets in the tfifo.
    If a child qdisc creates new SKBs during enqueue and informs its parent
    about this, netem's 'qlen' value is increased. When netem dequeues the
    newly created SKBs from the child, the 'qlen' in netem is not updated.
    If 'qlen' reaches the configured sch->limit, the enqueue function stops
    working, even though the tfifo is not full.

    Reproduce the bug:
    Ensure that the sender machine has GSO enabled. Configure netem as root
    qdisc and tbf as its child on the outgoing interface of the machine
    as follows:
    $ tc qdisc add dev <oif> root handle 1: netem delay 100ms limit 100
    $ tc qdisc add dev <oif> parent 1:0 tbf rate 50Mbit burst 1542 latency 50ms

    Send bulk TCP traffic out via this interface, e.g., by running an iPerf3
    client on the machine. Check the qdisc statistics:
    $ tc -s qdisc show dev <oif>

    Statistics after 10s of iPerf3 TCP test before the fix (note that
    netem's backlog > limit, netem stopped accepting packets):
    qdisc netem 1: root refcnt 2 limit 1000 delay 100ms
     Sent 2767766 bytes 1848 pkt (dropped 652, overlimits 0 requeues 0)
     backlog 4294528236b 1155p requeues 0
    qdisc tbf 10: parent 1:1 rate 50Mbit burst 1537b lat 50ms
     Sent 2767766 bytes 1848 pkt (dropped 327, overlimits 7601 requeues 0)
     backlog 0b 0p requeues 0

    Statistics after the fix:
    qdisc netem 1: root refcnt 2 limit 1000 delay 100ms
     Sent 37766372 bytes 24974 pkt (dropped 9, overlimits 0 requeues 0)
     backlog 0b 0p requeues 0
    qdisc tbf 10: parent 1:1 rate 50Mbit burst 1537b lat 50ms
     Sent 37766372 bytes 24974 pkt (dropped 327, overlimits 96017 requeues 0)
     backlog 0b 0p requeues 0

    tbf segments the GSO SKBs (tbf_segment) and updates the netem's 'qlen'.
    The interface fully stops transferring packets and locks. In this case,
    the child qdisc and tfifo are empty, but 'qlen' indicates the tfifo is at
    its limit and no more packets are accepted.

    This patch adds a counter for the entries in the tfifo. Netem's 'qlen' is
    only decreased when a packet is returned by its dequeue function, and not
    during enqueuing into the child qdisc. External updates to 'qlen' are thus
    accounted for and only the behavior of the backlog statistics changes. As
    in other qdiscs, 'qlen' then keeps track of  how many packets are held in
    netem and all of its children. As before, sch->limit remains as the
    maximum number of packets in the tfifo. The same applies to netem's
    backlog statistics.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://src.uniontech.com/#/security_advisory_detail?utsa_id=UTSA-2026-107329
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b3b626d3");
  # https://git.kernel.org/stable/c/10df49cfca73dfbbdb6c4150d859f7e8926ae427
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4df28254");
  # https://git.kernel.org/stable/c/216509dda290f6db92c816dd54b83c1df9da9e76
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4d98e1d7");
  # https://git.kernel.org/stable/c/356078a5c55ec8d2061fcc009fb8599f5b0527f9
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5de875cb");
  # https://git.kernel.org/stable/c/3824c5fad18eeb7abe0c4fc966f29959552dca3e
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ae3300a1");
  # https://git.kernel.org/stable/c/83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7286b715");
  # https://git.kernel.org/stable/c/c2047b0e216c8edce227d7c42f99ac2877dad0e4
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6a883693");
  # https://git.kernel.org/stable/c/f8d4bc455047cf3903cd6f85f49978987dbb3027
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?067b0b54");
  # https://lore.kernel.org/linux-cve-announce/2025010803-CVE-2024-56770-62ce@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d44ba7a8");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-56770");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-56770");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-56770");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Unity Linux Local Security Checks");

  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");
  script_require_keys("Host/local_checks_enabled", "Host/UOS-Server/release", "Host/UOS-Server/rpm-list", "Host/cpu");

  exit(0);
}
include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'UOS Server' >!< os_product) audit(AUDIT_OS_NOT, 'UOS Server');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'UOS Server');
if (! preg(pattern:"^(20.1050e|20.1060e|20.1070e)([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e / 20.1060e / 20.1070e', 'UOS Server ' + os_version);

if (!get_kb_item('Host/UOS-Server/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'amd64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1050e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2305.1.0.0199.122.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.122.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.122.uel20', 'sp':'1050e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1060e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2311.4.0.0227.122.uel20', 'sp':'1060e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2311.4.0.0227.122.uel20', 'sp':'1060e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2311.4.0.0227.122.uel20', 'sp':'1060e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2601.1.0.0023.uel20', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2601.1.0.0023.uel20', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2601.1.0.0023.uel20', 'sp':'1070e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}


if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel');
}