Unity Linux 20.1070a Security Update: kernel (UTSA-2025-990100)

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

include('compat.inc');

if (description)
{
  script_id(272523);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49409");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-990100)");

  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-2025-990100 advisory.

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

    ext4: fix bug_on in __es_tree_search

    Hulk Robot reported a BUG_ON:
    ==================================================================
    kernel BUG at fs/ext4/extents_status.c:199!
    [...]
    RIP: 0010:ext4_es_end fs/ext4/extents_status.c:199 [inline]
    RIP: 0010:__es_tree_search+0x1e0/0x260 fs/ext4/extents_status.c:217
    [...]
    Call Trace:
     ext4_es_cache_extent+0x109/0x340 fs/ext4/extents_status.c:766
     ext4_cache_extents+0x239/0x2e0 fs/ext4/extents.c:561
     ext4_find_extent+0x6b7/0xa20 fs/ext4/extents.c:964
     ext4_ext_map_blocks+0x16b/0x4b70 fs/ext4/extents.c:4384
     ext4_map_blocks+0xe26/0x19f0 fs/ext4/inode.c:567
     ext4_getblk+0x320/0x4c0 fs/ext4/inode.c:980
     ext4_bread+0x2d/0x170 fs/ext4/inode.c:1031
     ext4_quota_read+0x248/0x320 fs/ext4/super.c:6257
     v2_read_header+0x78/0x110 fs/quota/quota_v2.c:63
     v2_check_quota_file+0x76/0x230 fs/quota/quota_v2.c:82
     vfs_load_quota_inode+0x5d1/0x1530 fs/quota/dquot.c:2368
     dquot_enable+0x28a/0x330 fs/quota/dquot.c:2490
     ext4_quota_enable fs/ext4/super.c:6137 [inline]
     ext4_enable_quotas+0x5d7/0x960 fs/ext4/super.c:6163
     ext4_fill_super+0xa7c9/0xdc00 fs/ext4/super.c:4754
     mount_bdev+0x2e9/0x3b0 fs/super.c:1158
     mount_fs+0x4b/0x1e4 fs/super.c:1261
    [...]
    ==================================================================

    Above issue may happen as follows:
    -------------------------------------
    ext4_fill_super
     ext4_enable_quotas
      ext4_quota_enable
       ext4_iget
        __ext4_iget
         ext4_ext_check_inode
          ext4_ext_check
           __ext4_ext_check
            ext4_valid_extent_entries
             Check for overlapping extents does't take effect
       dquot_enable
        vfs_load_quota_inode
         v2_check_quota_file
          v2_read_header
           ext4_quota_read
            ext4_bread
             ext4_getblk
              ext4_map_blocks
               ext4_ext_map_blocks
                ext4_find_extent
                 ext4_cache_extents
                  ext4_es_cache_extent
                   ext4_es_cache_extent
                    __es_tree_search
                     ext4_es_end
                      BUG_ON(es->es_lblk + es->es_len < es->es_lblk)

    The error ext4 extents is as follows:
    0af3 0300 0400 0000 00000000    extent_header
    00000000 0100 0000 12000000     extent1
    00000000 0100 0000 18000000     extent2
    02000000 0400 0000 14000000     extent3

    In the ext4_valid_extent_entries function,
    if prev is 0, no error is returned even if lblock<=prev.
    This was intended to skip the check on the first extent, but
    in the error image above, prev=0+1-1=0 when checking the second extent,
    so even though lblock<=prev, the function does not return an error.
    As a result, bug_ON occurs in __es_tree_search and the system panics.

    To solve this problem, we only need to check that:
    1. The lblock of the first extent is not less than 0.
    2. The lblock of the next extent  is not less than
       the next block of the previous extent.
    The same applies to extent_idx.

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-2025-990100
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?28a7694a");
  # https://lore.kernel.org/linux-cve-announce/2025022652-CVE-2022-49409-b4e3@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bbbf4a32");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49409");
  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-2022-49409");

  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:"2022/11/08");
  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');
}