Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013648)

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

include('compat.inc');

if (description)
{
  script_id(309220);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/22");

  script_cve_id("CVE-2022-50780");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013648)");

  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-2026-013648 advisory.

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

    net: fix UAF issue in nfqnl_nf_hook_drop() when ops_init() failed

    When the ops_init() interface is invoked to initialize the net, but
    ops->init() fails, data is released. However, the ptr pointer in
    net->gen is invalid. In this case, when nfqnl_nf_hook_drop() is invoked
    to release the net, invalid address access occurs.

    The process is as follows:
    setup_net()
            ops_init()
                    data = kzalloc(...)   ---> alloc data
                    net_assign_generic()  ---> assign date to ptr in net->gen
                    ...
                    ops->init()           ---> failed
                    ...
                    kfree(data);          ---> ptr in net->gen is invalid
            ...
            ops_exit_list()
                    ...
                    nfqnl_nf_hook_drop()
                            *q = nfnl_queue_pernet(net) ---> q is invalid

    The following is the Call Trace information:
    BUG: KASAN: use-after-free in nfqnl_nf_hook_drop+0x264/0x280
    Read of size 8 at addr ffff88810396b240 by task ip/15855
    Call Trace:
    <TASK>
    dump_stack_lvl+0x8e/0xd1
    print_report+0x155/0x454
    kasan_report+0xba/0x1f0
    nfqnl_nf_hook_drop+0x264/0x280
    nf_queue_nf_hook_drop+0x8b/0x1b0
    __nf_unregister_net_hook+0x1ae/0x5a0
    nf_unregister_net_hooks+0xde/0x130
    ops_exit_list+0xb0/0x170
    setup_net+0x7ac/0xbd0
    copy_net_ns+0x2e6/0x6b0
    create_new_namespaces+0x382/0xa50
    unshare_nsproxy_namespaces+0xa6/0x1c0
    ksys_unshare+0x3a4/0x7e0
    __x64_sys_unshare+0x2d/0x40
    do_syscall_64+0x35/0x80
    entry_SYSCALL_64_after_hwframe+0x46/0xb0
    </TASK>

    Allocated by task 15855:
    kasan_save_stack+0x1e/0x40
    kasan_set_track+0x21/0x30
    __kasan_kmalloc+0xa1/0xb0
    __kmalloc+0x49/0xb0
    ops_init+0xe7/0x410
    setup_net+0x5aa/0xbd0
    copy_net_ns+0x2e6/0x6b0
    create_new_namespaces+0x382/0xa50
    unshare_nsproxy_namespaces+0xa6/0x1c0
    ksys_unshare+0x3a4/0x7e0
    __x64_sys_unshare+0x2d/0x40
    do_syscall_64+0x35/0x80
    entry_SYSCALL_64_after_hwframe+0x46/0xb0

    Freed by task 15855:
    kasan_save_stack+0x1e/0x40
    kasan_set_track+0x21/0x30
    kasan_save_free_info+0x2a/0x40
    ____kasan_slab_free+0x155/0x1b0
    slab_free_freelist_hook+0x11b/0x220
    __kmem_cache_free+0xa4/0x360
    ops_init+0xb9/0x410
    setup_net+0x5aa/0xbd0
    copy_net_ns+0x2e6/0x6b0
    create_new_namespaces+0x382/0xa50
    unshare_nsproxy_namespaces+0xa6/0x1c0
    ksys_unshare+0x3a4/0x7e0
    __x64_sys_unshare+0x2d/0x40
    do_syscall_64+0x35/0x80
    entry_SYSCALL_64_after_hwframe+0x46/0xb0

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-2026-013648
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9b188aa7");
  # https://lore.kernel.org/linux-cve-announce/2025122401-CVE-2022-50780-bc90@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?16c3bde6");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50780");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:S/C:C/I:P/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:H/PR:L/UI:N/S:U/C:H/I:L/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-2022-50780");

  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:"2021/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/22");

  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:"^20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1070a', '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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-28', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-28', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-28', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-28', 'sp':'1070a', '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');
}