Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102140)

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

include('compat.inc');

if (description)
{
  script_id(337270);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/18");

  script_cve_id("CVE-2025-40248");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102140)");

  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-2026-102140 advisory.

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

    vsock: Ignore signal/timeout on connect() if already established

    During connect(), acting on a signal/timeout by disconnecting an already
    established socket leads to several issues:

    1. connect() invoking vsock_transport_cancel_pkt() ->
       virtio_transport_purge_skbs() may race with sendmsg() invoking
       virtio_transport_get_credit(). This results in a permanently elevated
       `vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling.

    2. connect() resetting a connected socket's state may race with socket
       being placed in a sockmap. A disconnected socket remaining in a sockmap
       breaks sockmap's assumptions. And gives rise to WARNs.

    3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a
       transport change/drop after TCP_ESTABLISHED. Which poses a problem for
       any simultaneous sendmsg() or connect() and may result in a
       use-after-free/null-ptr-deref.

    Do not disconnect socket on signal/timeout. Keep the logic for unconnected
    sockets: they don't linger, can't be placed in a sockmap, are rejected by
    sendmsg().

    [1]: https://lore.kernel.org/netdev/[email protected]/
    [2]: https://lore.kernel.org/netdev/[email protected]/
    [3]: https://lore.kernel.org/netdev/[email protected]/

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-2026-102140
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ee329a22");
  # https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?18d1ab62");
  # https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?467b9778");
  # https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f487c503");
  # https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?68053e41");
  # https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?32bfb155");
  # https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?81692a86");
  # https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?650c4157");
  # https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e013d53b");
  # https://lore.kernel.org/linux-cve-announce/2025120430-CVE-2025-40248-506e@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f9979925");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-40248");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-40248");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/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:H/I:H/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-2025-40248");

  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:"2025/12/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/18");

  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([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e', '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-4.19.90-2211.5.0.0178.67.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.67.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.67.uel20', 'sp':'1050e', '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');
}