Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989221)

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

include('compat.inc');

if (description)
{
  script_id(273259);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49179");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989221)");

  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-2025-989221 advisory.

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

    block, bfq: don't move oom_bfqq

    Our test report a UAF:

    [ 2073.019181] ==================================================================
    [ 2073.019188] BUG: KASAN: use-after-free in __bfq_put_async_bfqq+0xa0/0x168
    [ 2073.019191] Write of size 8 at addr ffff8000ccf64128 by task rmmod/72584
    [ 2073.019192]
    [ 2073.019196] CPU: 0 PID: 72584 Comm: rmmod Kdump: loaded Not tainted 4.19.90-yk #5
    [ 2073.019198] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
    [ 2073.019200] Call trace:
    [ 2073.019203]  dump_backtrace+0x0/0x310
    [ 2073.019206]  show_stack+0x28/0x38
    [ 2073.019210]  dump_stack+0xec/0x15c
    [ 2073.019216]  print_address_description+0x68/0x2d0
    [ 2073.019220]  kasan_report+0x238/0x2f0
    [ 2073.019224]  __asan_store8+0x88/0xb0
    [ 2073.019229]  __bfq_put_async_bfqq+0xa0/0x168
    [ 2073.019233]  bfq_put_async_queues+0xbc/0x208
    [ 2073.019236]  bfq_pd_offline+0x178/0x238
    [ 2073.019240]  blkcg_deactivate_policy+0x1f0/0x420
    [ 2073.019244]  bfq_exit_queue+0x128/0x178
    [ 2073.019249]  blk_mq_exit_sched+0x12c/0x160
    [ 2073.019252]  elevator_exit+0xc8/0xd0
    [ 2073.019256]  blk_exit_queue+0x50/0x88
    [ 2073.019259]  blk_cleanup_queue+0x228/0x3d8
    [ 2073.019267]  null_del_dev+0xfc/0x1e0 [null_blk]
    [ 2073.019274]  null_exit+0x90/0x114 [null_blk]
    [ 2073.019278]  __arm64_sys_delete_module+0x358/0x5a0
    [ 2073.019282]  el0_svc_common+0xc8/0x320
    [ 2073.019287]  el0_svc_handler+0xf8/0x160
    [ 2073.019290]  el0_svc+0x10/0x218
    [ 2073.019291]
    [ 2073.019294] Allocated by task 14163:
    [ 2073.019301]  kasan_kmalloc+0xe0/0x190
    [ 2073.019305]  kmem_cache_alloc_node_trace+0x1cc/0x418
    [ 2073.019308]  bfq_pd_alloc+0x54/0x118
    [ 2073.019313]  blkcg_activate_policy+0x250/0x460
    [ 2073.019317]  bfq_create_group_hierarchy+0x38/0x110
    [ 2073.019321]  bfq_init_queue+0x6d0/0x948
    [ 2073.019325]  blk_mq_init_sched+0x1d8/0x390
    [ 2073.019330]  elevator_switch_mq+0x88/0x170
    [ 2073.019334]  elevator_switch+0x140/0x270
    [ 2073.019338]  elv_iosched_store+0x1a4/0x2a0
    [ 2073.019342]  queue_attr_store+0x90/0xe0
    [ 2073.019348]  sysfs_kf_write+0xa8/0xe8
    [ 2073.019351]  kernfs_fop_write+0x1f8/0x378
    [ 2073.019359]  __vfs_write+0xe0/0x360
    [ 2073.019363]  vfs_write+0xf0/0x270
    [ 2073.019367]  ksys_write+0xdc/0x1b8
    [ 2073.019371]  __arm64_sys_write+0x50/0x60
    [ 2073.019375]  el0_svc_common+0xc8/0x320
    [ 2073.019380]  el0_svc_handler+0xf8/0x160
    [ 2073.019383]  el0_svc+0x10/0x218
    [ 2073.019385]
    [ 2073.019387] Freed by task 72584:
    [ 2073.019391]  __kasan_slab_free+0x120/0x228
    [ 2073.019394]  kasan_slab_free+0x10/0x18
    [ 2073.019397]  kfree+0x94/0x368
    [ 2073.019400]  bfqg_put+0x64/0xb0
    [ 2073.019404]  bfqg_and_blkg_put+0x90/0xb0
    [ 2073.019408]  bfq_put_queue+0x220/0x228
    [ 2073.019413]  __bfq_put_async_bfqq+0x98/0x168
    [ 2073.019416]  bfq_put_async_queues+0xbc/0x208
    [ 2073.019420]  bfq_pd_offline+0x178/0x238
    [ 2073.019424]  blkcg_deactivate_policy+0x1f0/0x420
    [ 2073.019429]  bfq_exit_queue+0x128/0x178
    [ 2073.019433]  blk_mq_exit_sched+0x12c/0x160
    [ 2073.019437]  elevator_exit+0xc8/0xd0
    [ 2073.019440]  blk_exit_queue+0x50/0x88
    [ 2073.019443]  blk_cleanup_queue+0x228/0x3d8
    [ 2073.019451]  null_del_dev+0xfc/0x1e0 [null_blk]
    [ 2073.019459]  null_exit+0x90/0x114 [null_blk]
    [ 2073.019462]  __arm64_sys_delete_module+0x358/0x5a0
    [ 2073.019467]  el0_svc_common+0xc8/0x320
    [ 2073.019471]  el0_svc_handler+0xf8/0x160
    [ 2073.019474]  el0_svc+0x10/0x218
    [ 2073.019475]
    [ 2073.019479] The buggy address belongs to the object at ffff8000ccf63f00
     which belongs to the cache kmalloc-1024 of size 1024
    [ 2073.019484] The buggy address is located 552 bytes inside of
     1024-byte region [ffff8000ccf63f00, ffff8000ccf64300)
    [ 2073.019486] The buggy address belongs to the page:
    [ 2073.019492] page:ffff7e000333d800 count:1 mapcount:0 mapping:ffff8000c0003a00 index:0x0
    compound_mapcount: 0
    [ 2073.020123] flags: 0x7ffff0000008100(slab|head)
    [ 2073.020403] raw: 07ffff0000008100 ffff7e0003334c08 ffff7e00001f5a08 ffff8000c0003a00
    [ 2073.020409] ra
    ---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-2025-989221
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?56d9765a");
  # https://lore.kernel.org/linux-cve-announce/2025022614-CVE-2022-49179-9857@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?951d4d6d");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49179");
  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:H/I:H/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-2022-49179");

  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:"2022/11/15");
  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');
}