Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988673)

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

include('compat.inc');

if (description)
{
  script_id(273800);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49880");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988673)");

  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-2025-988673 advisory.

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

    ext4: fix warning in 'ext4_da_release_space'

    Syzkaller report issue as follows:
    EXT4-fs (loop0): Free/Dirty block details
    EXT4-fs (loop0): free_blocks=0
    EXT4-fs (loop0): dirty_blocks=0
    EXT4-fs (loop0): Block reservation details
    EXT4-fs (loop0): i_reserved_data_blocks=0
    EXT4-fs warning (device loop0): ext4_da_release_space:1527: ext4_da_release_space: ino 18, to_free 1 with
    only 0 reserved data blocks
    ------------[ cut here ]------------
    WARNING: CPU: 0 PID: 92 at fs/ext4/inode.c:1528 ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1524
    Modules linked in:
    CPU: 0 PID: 92 Comm: kworker/u4:4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
    Workqueue: writeback wb_workfn (flush-7:0)
    RIP: 0010:ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1528
    RSP: 0018:ffffc900015f6c90 EFLAGS: 00010296
    RAX: 42215896cd52ea00 RBX: 0000000000000000 RCX: 42215896cd52ea00
    RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
    RBP: 1ffff1100e907d96 R08: ffffffff816aa79d R09: fffff520002bece5
    R10: fffff520002bece5 R11: 1ffff920002bece4 R12: ffff888021fd2000
    R13: ffff88807483ecb0 R14: 0000000000000001 R15: ffff88807483e740
    FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00005555569ba628 CR3: 000000000c88e000 CR4: 00000000003506f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     <TASK>
     ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461
     mpage_release_unused_pages+0x24d/0xef0 fs/ext4/inode.c:1589
     ext4_writepages+0x12eb/0x3be0 fs/ext4/inode.c:2852
     do_writepages+0x3c3/0x680 mm/page-writeback.c:2469
     __writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587
     writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1870
     wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2044
     wb_do_writeback fs/fs-writeback.c:2187 [inline]
     wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2227
     process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
     worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
     kthread+0x266/0x300 kernel/kthread.c:376
     ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
     </TASK>

    Above issue may happens as follows:
    ext4_da_write_begin
      ext4_create_inline_data
        ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
        ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
    __ext4_ioctl
      ext4_ext_migrate -> will lead to eh->eh_entries not zero, and set extent flag
    ext4_da_write_begin
      ext4_da_convert_inline_data_to_extent
        ext4_da_write_inline_data_begin
          ext4_da_map_blocks
            ext4_insert_delayed_block
              if (!ext4_es_scan_clu(inode, &ext4_es_is_delonly, lblk))
                if (!ext4_es_scan_clu(inode, &ext4_es_is_mapped, lblk))
                  ext4_clu_mapped(inode, EXT4_B2C(sbi, lblk)); -> will return 1
                   allocated = true;
              ext4_es_insert_delayed_block(inode, lblk, allocated);
    ext4_writepages
      mpage_map_and_submit_extent(handle, &mpd, &give_up_on_write); -> return -ENOSPC
      mpage_release_unused_pages(&mpd, give_up_on_write); -> give_up_on_write == 1
        ext4_es_remove_extent
          ext4_da_release_space(inode, reserved);
            if (unlikely(to_free > ei->i_reserved_data_blocks))
              -> to_free == 1  but ei->i_reserved_data_blocks == 0
              -> then trigger warning as above

    To solve above issue, forbid inode do migrate which has inline data.

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-2025-988673
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3d083684");
  # https://lore.kernel.org/linux-cve-announce/2025050154-CVE-2022-49880-709b@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cf7bc349");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49880");
  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-2022-49880");

  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:"2022/12/08");
  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');
}