Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013757)

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

include('compat.inc');

if (description)
{
  script_id(309254);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/22");

  script_cve_id("CVE-2022-50579");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013757)");

  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-2026-013757 advisory.

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

    arm64: ftrace: fix module PLTs with mcount

    Li Huafei reports that mcount-based ftrace with module PLTs was broken
    by commit:

      a6253579977e4c6f (arm64: ftrace: consistently handle PLTs.)

    When a module PLTs are used and a module is loaded sufficiently far away
    from the kernel, we'll create PLTs for any branches which are
    out-of-range. These are separate from the special ftrace trampoline
    PLTs, which the module PLT code doesn't directly manipulate.

    When mcount is in use this is a problem, as each mcount callsite in a
    module will be initialized to point to a module PLT, but since commit
    a6253579977e4c6f ftrace_make_nop() will assume that the callsite has
    been initialized to point to the special ftrace trampoline PLT, and
    ftrace_find_callable_addr() rejects other cases.

    This means that when ftrace tries to initialize a callsite via
    ftrace_make_nop(), the call to ftrace_find_callable_addr() will find
    that the `_mcount` stub is out-of-range and is not handled by the ftrace
    PLT, resulting in a splat:

    | ftrace_test: loading out-of-tree module taints kernel.
    | ftrace: no module PLT for _mcount
    | ------------[ ftrace bug ]------------
    | ftrace failed to modify
    | [<ffff800029180014>] 0xffff800029180014
    |  actual:   44:00:00:94
    | Initializing ftrace call sites
    | ftrace record flags: 2000000
    |  (0)
    |  expected tramp: ffff80000802eb3c
    | ------------[ cut here ]------------
    | WARNING: CPU: 3 PID: 157 at kernel/trace/ftrace.c:2120 ftrace_bug+0x94/0x270
    | Modules linked in:
    | CPU: 3 PID: 157 Comm: insmod Tainted: G           O       6.0.0-rc6-00151-gcd722513a189-dirty #22
    | Hardware name: linux,dummy-virt (DT)
    | pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    | pc : ftrace_bug+0x94/0x270
    | lr : ftrace_bug+0x21c/0x270
    | sp : ffff80000b2bbaf0
    | x29: ffff80000b2bbaf0 x28: 0000000000000000 x27: ffff0000c4d38000
    | x26: 0000000000000001 x25: ffff800009d7e000 x24: ffff0000c4d86e00
    | x23: 0000000002000000 x22: ffff80000a62b000 x21: ffff8000098ebea8
    | x20: ffff0000c4d38000 x19: ffff80000aa24158 x18: ffffffffffffffff
    | x17: 0000000000000000 x16: 0a0d2d2d2d2d2d2d x15: ffff800009aa9118
    | x14: 0000000000000000 x13: 6333626532303830 x12: 3030303866666666
    | x11: 203a706d61727420 x10: 6465746365707865 x9 : 3362653230383030
    | x8 : c0000000ffffefff x7 : 0000000000017fe8 x6 : 000000000000bff4
    | x5 : 0000000000057fa8 x4 : 0000000000000000 x3 : 0000000000000001
    | x2 : ad2cb14bb5438900 x1 : 0000000000000000 x0 : 0000000000000022
    | Call trace:
    |  ftrace_bug+0x94/0x270
    |  ftrace_process_locs+0x308/0x430
    |  ftrace_module_init+0x44/0x60
    |  load_module+0x15b4/0x1ce8
    |  __do_sys_init_module+0x1ec/0x238
    |  __arm64_sys_init_module+0x24/0x30
    |  invoke_syscall+0x54/0x118
    |  el0_svc_common.constprop.4+0x84/0x100
    |  do_el0_svc+0x3c/0xd0
    |  el0_svc+0x1c/0x50
    |  el0t_64_sync_handler+0x90/0xb8
    |  el0t_64_sync+0x15c/0x160
    | ---[ end trace 0000000000000000 ]---
    | ---------test_init-----------

    Fix this by reverting to the old behaviour of ignoring the old
    instruction when initialising an mcount callsite in a module, which was
    the behaviour prior to commit a6253579977e4c6f.

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-2026-013757
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?76fefb9c");
  # https://lore.kernel.org/linux-cve-announce/2025102209-CVE-2022-50579-0f47@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e9c7c08e");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50579");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:M/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:H/PR:H/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-2022-50579");

  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:"2025/09/29");
  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-5.10.0-26', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-26', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-26', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-26', '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_NOTE,
      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');
}