Unity Linux 20.1070e Security Update: kernel (UTSA-2026-010782)

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

include('compat.inc');

if (description)
{
  script_id(308387);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2022-50661");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2026-010782)");

  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-2026-010782 advisory.

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

    seccomp: Move copy_seccomp() to no failure path.

    Our syzbot instance reported memory leaks in do_seccomp() [0], similar
    to the report [1].  It shows that we miss freeing struct seccomp_filter
    and some objects included in it.

    We can reproduce the issue with the program below [2] which calls one
    seccomp() and two clone() syscalls.

    The first clone()d child exits earlier than its parent and sends a
    signal to kill it during the second clone(), more precisely before the
    fatal_signal_pending() test in copy_process().  When the parent receives
    the signal, it has to destroy the embryonic process and return -EINTR to
    user space.  In the failure path, we have to call seccomp_filter_release()
    to decrement the filter's refcount.

    Initially, we called it in free_task() called from the failure path, but
    the commit 3a15fb6ed92c (seccomp: release filter after task is fully
    dead) moved it to release_task() to notify user space as early as possible
    that the filter is no longer used.

    To keep the change and current seccomp refcount semantics, let's move
    copy_seccomp() just after the signal check and add a WARN_ON_ONCE() in
    free_task() for future debugging.

    [0]:
    unreferenced object 0xffff8880063add00 (size 256):
      comm repro_seccomp, pid 230, jiffies 4294687090 (age 9.914s)
      hex dump (first 32 bytes):
        01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
        ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
      backtrace:
        do_seccomp (./include/linux/slab.h:600 ./include/linux/slab.h:733 kernel/seccomp.c:666
    kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
        do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
        entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
    unreferenced object 0xffffc90000035000 (size 4096):
      comm repro_seccomp, pid 230, jiffies 4294687090 (age 9.915s)
      hex dump (first 32 bytes):
        01 00 00 00 00 00 00 00 00 00 00 00 05 00 00 00  ................
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
      backtrace:
        __vmalloc_node_range (mm/vmalloc.c:3226)
        __vmalloc_node (mm/vmalloc.c:3261 (discriminator 4))
        bpf_prog_alloc_no_stats (kernel/bpf/core.c:91)
        bpf_prog_alloc (kernel/bpf/core.c:129)
        bpf_prog_create_from_user (net/core/filter.c:1414)
        do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
        do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
        entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
    unreferenced object 0xffff888003fa1000 (size 1024):
      comm repro_seccomp, pid 230, jiffies 4294687090 (age 9.915s)
      hex dump (first 32 bytes):
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
      backtrace:
        bpf_prog_alloc_no_stats (./include/linux/slab.h:600 ./include/linux/slab.h:733 kernel/bpf/core.c:95)
        bpf_prog_alloc (kernel/bpf/core.c:129)
        bpf_prog_create_from_user (net/core/filter.c:1414)
        do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
        do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
        entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
    unreferenced object 0xffff888006360240 (size 16):
      comm repro_seccomp, pid 230, jiffies 4294687090 (age 9.915s)
      hex dump (first 16 bytes):
        01 00 37 00 76 65 72 6c e0 83 01 06 80 88 ff ff  ..7.verl........
      backtrace:
        bpf_prog_store_orig_filter (net/core/filter.c:1137)
        bpf_prog_create_from_user (net/core/filter.c:1428)
        do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
        do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
        entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
    unreferenced object 0xffff888
    ---truncated---

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-2026-010782
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?567cddc6");
  # https://lore.kernel.org/linux-cve-announce/2025120942-CVE-2022-50661-ff17@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9b7fb9d3");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50661");
  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-2022-50661");

  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:"2026/04/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/21");

  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:"^20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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 && 'sw_64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-57', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-57', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-57', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-57', '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');
}