Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992196)

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

include('compat.inc');

if (description)
{
  script_id(280522);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/30");

  script_cve_id("CVE-2022-50396");

  script_name(english:"Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992196)");

  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-2025-992196 advisory.

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

    net: sched: fix memory leak in tcindex_set_parms

    Syzkaller reports a memory leak as follows:
    ====================================
    BUG: memory leak
    unreferenced object 0xffff88810c287f00 (size 256):
      comm syz-executor105, pid 3600, jiffies 4294943292 (age 12.990s)
      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:
        [<ffffffff814cf9f0>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1046
        [<ffffffff839c9e07>] kmalloc include/linux/slab.h:576 [inline]
        [<ffffffff839c9e07>] kmalloc_array include/linux/slab.h:627 [inline]
        [<ffffffff839c9e07>] kcalloc include/linux/slab.h:659 [inline]
        [<ffffffff839c9e07>] tcf_exts_init include/net/pkt_cls.h:250 [inline]
        [<ffffffff839c9e07>] tcindex_set_parms+0xa7/0xbe0 net/sched/cls_tcindex.c:342
        [<ffffffff839caa1f>] tcindex_change+0xdf/0x120 net/sched/cls_tcindex.c:553
        [<ffffffff8394db62>] tc_new_tfilter+0x4f2/0x1100 net/sched/cls_api.c:2147
        [<ffffffff8389e91c>] rtnetlink_rcv_msg+0x4dc/0x5d0 net/core/rtnetlink.c:6082
        [<ffffffff839eba67>] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2540
        [<ffffffff839eab87>] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
        [<ffffffff839eab87>] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345
        [<ffffffff839eb046>] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921
        [<ffffffff8383e796>] sock_sendmsg_nosec net/socket.c:714 [inline]
        [<ffffffff8383e796>] sock_sendmsg+0x56/0x80 net/socket.c:734
        [<ffffffff8383eb08>] ____sys_sendmsg+0x178/0x410 net/socket.c:2482
        [<ffffffff83843678>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536
        [<ffffffff838439c5>] __sys_sendmmsg+0x105/0x330 net/socket.c:2622
        [<ffffffff83843c14>] __do_sys_sendmmsg net/socket.c:2651 [inline]
        [<ffffffff83843c14>] __se_sys_sendmmsg net/socket.c:2648 [inline]
        [<ffffffff83843c14>] __x64_sys_sendmmsg+0x24/0x30 net/socket.c:2648
        [<ffffffff84605fd5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
        [<ffffffff84605fd5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
        [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
    ====================================

    Kernel uses tcindex_change() to change an existing
    filter properties.

    Yet the problem is that, during the process of changing,
    if `old_r` is retrieved from `p->perfect`, then
    kernel uses tcindex_alloc_perfect_hash() to newly
    allocate filter results, uses tcindex_filter_result_init()
    to clear the old filter result, without destroying
    its tcf_exts structure, which triggers the above memory leak.

    To be more specific, there are only two source for the `old_r`,
    according to the tcindex_lookup(). `old_r` is retrieved from
    `p->perfect`, or `old_r` is retrieved from `p->h`.

      * If `old_r` is retrieved from `p->perfect`, kernel uses
    tcindex_alloc_perfect_hash() to newly allocate the
    filter results. Then `r` is assigned with `cp->perfect + handle`,
    which is newly allocated. So condition `old_r && old_r != r` is
    true in this situation, and kernel uses tcindex_filter_result_init()
    to clear the old filter result, without destroying
    its tcf_exts structure

      * If `old_r` is retrieved from `p->h`, then `p->perfect` is NULL
    according to the tcindex_lookup(). Considering that `cp->h`
    is directly copied from `p->h` and `p->perfect` is NULL,
    `r` is assigned with `tcindex_lookup(cp, handle)`, whose value
    should be the same as `old_r`, so condition `old_r && old_r != r`
    is false in this situation, kernel ignores using
    tcindex_filter_result_init() to clear the old filter result.

    So only when `old_r` is retrieved from `p->perfect` does kernel use
    tcindex_filter_result_init() to clear the old filter result, which
    triggers the above memory leak.

    Considering that there already exists a tc_filter_wq workqueue
    to destroy the old tcindex_d
    ---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-2025-992196
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?726e349d");
  # https://lore.kernel.org/linux-cve-announce/2025091854-CVE-2022-50396-8b1b@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?51ededdd");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50396");
  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-2022-50396");

  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:"2021/09/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/30");

  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:"^20.1060e|20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060e / 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 && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1060e',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070e', 'cpu':'aarch64', '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');
}