Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988764)

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

include('compat.inc');

if (description)
{
  script_id(273440);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-48631");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988764)");

  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-2025-988764 advisory.

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

    ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0

    When walking through an inode extents, the ext4_ext_binsearch_idx() function
    assumes that the extent header has been previously validated.  However, there
    are no checks that verify that the number of entries (eh->eh_entries) is
    non-zero when depth is > 0.  And this will lead to problems because the
    EXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:

    [  135.245946] ------------[ cut here ]------------
    [  135.247579] kernel BUG at fs/ext4/extents.c:2258!
    [  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP
    [  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4
    [  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014
    [  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0
    [  135.256475] Code:
    [  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246
    [  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023
    [  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c
    [  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c
    [  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024
    [  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000
    [  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
    [  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0
    [  135.277952] Call Trace:
    [  135.278635]  <TASK>
    [  135.279247]  ? preempt_count_add+0x6d/0xa0
    [  135.280358]  ? percpu_counter_add_batch+0x55/0xb0
    [  135.281612]  ? _raw_read_unlock+0x18/0x30
    [  135.282704]  ext4_map_blocks+0x294/0x5a0
    [  135.283745]  ? xa_load+0x6f/0xa0
    [  135.284562]  ext4_mpage_readpages+0x3d6/0x770
    [  135.285646]  read_pages+0x67/0x1d0
    [  135.286492]  ? folio_add_lru+0x51/0x80
    [  135.287441]  page_cache_ra_unbounded+0x124/0x170
    [  135.288510]  filemap_get_pages+0x23d/0x5a0
    [  135.289457]  ? path_openat+0xa72/0xdd0
    [  135.290332]  filemap_read+0xbf/0x300
    [  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40
    [  135.292192]  new_sync_read+0x103/0x170
    [  135.293014]  vfs_read+0x15d/0x180
    [  135.293745]  ksys_read+0xa1/0xe0
    [  135.294461]  do_syscall_64+0x3c/0x80
    [  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0

    This patch simply adds an extra check in __ext4_ext_check(), verifying that
    eh_entries is not 0 when eh_depth is > 0.

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-2025-988764
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d04ccfa3");
  # https://lore.kernel.org/linux-cve-announce/2024042851-CVE-2022-48631-cab6@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9cbcded1");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-48631");
  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-2022-48631");

  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:"2025/11/05");
  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');
}