Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989756)

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

include('compat.inc');

if (description)
{
  script_id(273797);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49706");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989756)");

  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-2025-989756 advisory.

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

    zonefs: fix zonefs_iomap_begin() for reads

    If a readahead is issued to a sequential zone file with an offset
    exactly equal to the current file size, the iomap type is set to
    IOMAP_UNWRITTEN, which will prevent an IO, but the iomap length is
    calculated as 0. This causes a WARN_ON() in iomap_iter():

    [17309.548939] WARNING: CPU: 3 PID: 2137 at fs/iomap/iter.c:34 iomap_iter+0x9cf/0xe80
    [...]
    [17309.650907] RIP: 0010:iomap_iter+0x9cf/0xe80
    [...]
    [17309.754560] Call Trace:
    [17309.757078]  <TASK>
    [17309.759240]  ? lock_is_held_type+0xd8/0x130
    [17309.763531]  iomap_readahead+0x1a8/0x870
    [17309.767550]  ? iomap_read_folio+0x4c0/0x4c0
    [17309.771817]  ? lockdep_hardirqs_on_prepare+0x400/0x400
    [17309.778848]  ? lock_release+0x370/0x750
    [17309.784462]  ? folio_add_lru+0x217/0x3f0
    [17309.790220]  ? reacquire_held_locks+0x4e0/0x4e0
    [17309.796543]  read_pages+0x17d/0xb60
    [17309.801854]  ? folio_add_lru+0x238/0x3f0
    [17309.807573]  ? readahead_expand+0x5f0/0x5f0
    [17309.813554]  ? policy_node+0xb5/0x140
    [17309.819018]  page_cache_ra_unbounded+0x27d/0x450
    [17309.825439]  filemap_get_pages+0x500/0x1450
    [17309.831444]  ? filemap_add_folio+0x140/0x140
    [17309.837519]  ? lock_is_held_type+0xd8/0x130
    [17309.843509]  filemap_read+0x28c/0x9f0
    [17309.848953]  ? zonefs_file_read_iter+0x1ea/0x4d0 [zonefs]
    [17309.856162]  ? trace_contention_end+0xd6/0x130
    [17309.862416]  ? __mutex_lock+0x221/0x1480
    [17309.868151]  ? zonefs_file_read_iter+0x166/0x4d0 [zonefs]
    [17309.875364]  ? filemap_get_pages+0x1450/0x1450
    [17309.881647]  ? __mutex_unlock_slowpath+0x15e/0x620
    [17309.888248]  ? wait_for_completion_io_timeout+0x20/0x20
    [17309.895231]  ? lock_is_held_type+0xd8/0x130
    [17309.901115]  ? lock_is_held_type+0xd8/0x130
    [17309.906934]  zonefs_file_read_iter+0x356/0x4d0 [zonefs]
    [17309.913750]  new_sync_read+0x2d8/0x520
    [17309.919035]  ? __x64_sys_lseek+0x1d0/0x1d0

    Furthermore, this causes iomap_readahead() to loop forever as
    iomap_readahead_iter() always returns 0, making no progress.

    Fix this by treating reads after the file size as access to holes,
    setting the iomap type to IOMAP_HOLE, the iomap addr to IOMAP_NULL_ADDR
    and using the length argument as is for the iomap length. To simplify
    the code with this change, zonefs_iomap_begin() is split into the read
    variant, zonefs_read_iomap_begin() and zonefs_read_iomap_ops, and the
    write variant, zonefs_write_iomap_begin() and zonefs_write_iomap_ops.

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-2025-989756
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?84104602");
  # https://lore.kernel.org/linux-cve-announce/2025022630-CVE-2022-49706-eed8@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ebd6de00");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49706");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/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: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-2022-49706");

  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:"2022/07/15");
  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:"^20.1070e([^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 && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}