Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989072)

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

include('compat.inc');

if (description)
{
  script_id(273974);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-48970");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989072)");

  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-2025-989072 advisory.

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

    af_unix: Get user_ns from in_skb in unix_diag_get_exact().

    Wei Chen reported a NULL deref in sk_user_ns() [0][1], and Paolo diagnosed
    the root cause: in unix_diag_get_exact(), the newly allocated skb does not
    have sk. [2]

    We must get the user_ns from the NETLINK_CB(in_skb).sk and pass it to
    sk_diag_fill().

    [0]:
    BUG: kernel NULL pointer dereference, address: 0000000000000270
    #PF: supervisor read access in kernel mode
    #PF: error_code(0x0000) - not-present page
    PGD 12bbce067 P4D 12bbce067 PUD 12bc40067 PMD 0
    Oops: 0000 [#1] PREEMPT SMP
    CPU: 0 PID: 27942 Comm: syz-executor.0 Not tainted 6.1.0-rc5-next-20221118 #2
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
    RIP: 0010:sk_user_ns include/net/sock.h:920 [inline]
    RIP: 0010:sk_diag_dump_uid net/unix/diag.c:119 [inline]
    RIP: 0010:sk_diag_fill+0x77d/0x890 net/unix/diag.c:170
    Code: 89 ef e8 66 d4 2d fd c7 44 24 40 00 00 00 00 49 8d 7c 24 18 e8
    54 d7 2d fd 49 8b 5c 24 18 48 8d bb 70 02 00 00 e8 43 d7 2d fd <48> 8b
    9b 70 02 00 00 48 8d 7b 10 e8 33 d7 2d fd 48 8b 5b 10 48 8d
    RSP: 0018:ffffc90000d67968 EFLAGS: 00010246
    RAX: ffff88812badaa48 RBX: 0000000000000000 RCX: ffffffff840d481d
    RDX: 0000000000000465 RSI: 0000000000000000 RDI: 0000000000000270
    RBP: ffffc90000d679a8 R08: 0000000000000277 R09: 0000000000000000
    R10: 0001ffffffffffff R11: 0001c90000d679a8 R12: ffff88812ac03800
    R13: ffff88812c87c400 R14: ffff88812ae42210 R15: ffff888103026940
    FS:  00007f08b4e6f700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000270 CR3: 000000012c58b000 CR4: 00000000003506f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     <TASK>
     unix_diag_get_exact net/unix/diag.c:285 [inline]
     unix_diag_handler_dump+0x3f9/0x500 net/unix/diag.c:317
     __sock_diag_cmd net/core/sock_diag.c:235 [inline]
     sock_diag_rcv_msg+0x237/0x250 net/core/sock_diag.c:266
     netlink_rcv_skb+0x13e/0x250 net/netlink/af_netlink.c:2564
     sock_diag_rcv+0x24/0x40 net/core/sock_diag.c:277
     netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
     netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1356
     netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1932
     sock_sendmsg_nosec net/socket.c:714 [inline]
     sock_sendmsg net/socket.c:734 [inline]
     ____sys_sendmsg+0x38f/0x500 net/socket.c:2476
     ___sys_sendmsg net/socket.c:2530 [inline]
     __sys_sendmsg+0x197/0x230 net/socket.c:2559
     __do_sys_sendmsg net/socket.c:2568 [inline]
     __se_sys_sendmsg net/socket.c:2566 [inline]
     __x64_sys_sendmsg+0x42/0x50 net/socket.c:2566
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x63/0xcd
    RIP: 0033:0x4697f9
    Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48
    89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
    01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007f08b4e6ec48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
    RAX: ffffffffffffffda RBX: 000000000077bf80 RCX: 00000000004697f9
    RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
    RBP: 00000000004d29e9 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 000000000077bf80
    R13: 0000000000000000 R14: 000000000077bf80 R15: 00007ffdb36bc6c0
     </TASK>
    Modules linked in:
    CR2: 0000000000000270

    [1]: https://lore.kernel.org/netdev/CAO4mrfdvyjFpokhNsiwZiP-wpdSD0AStcJwfKcKQdAALQ9_2Qw@mail.gmail.com/
    [2]: 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-2025-989072
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?30df239f");
  # https://lore.kernel.org/linux-cve-announce/2024102144-CVE-2022-48970-7c96@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?027a676f");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-48970");
  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-2022-48970");

  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:"2023/01/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  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) 2025 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-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}