Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-993031)

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

include('compat.inc');

if (description)
{
  script_id(281229);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/31");

  script_cve_id("CVE-2022-50067");

  script_name(english:"Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-993031)");

  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-2025-993031 advisory.

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

    btrfs: unset reloc control if transaction commit fails in prepare_to_relocate()

    In btrfs_relocate_block_group(), the rc is allocated.  Then
    btrfs_relocate_block_group() calls

    relocate_block_group()
      prepare_to_relocate()
        set_reloc_control()

    that assigns rc to the variable fs_info->reloc_ctl. When
    prepare_to_relocate() returns, it calls

    btrfs_commit_transaction()
      btrfs_start_dirty_block_groups()
        btrfs_alloc_path()
          kmem_cache_zalloc()

    which may fail for example (or other errors could happen). When the
    failure occurs, btrfs_relocate_block_group() detects the error and frees
    rc and doesn't set fs_info->reloc_ctl to NULL. After that, in
    btrfs_init_reloc_root(), rc is retrieved from fs_info->reloc_ctl and
    then used, which may cause a use-after-free bug.

    This possible bug can be triggered by calling btrfs_ioctl_balance()
    before calling btrfs_ioctl_defrag().

    To fix this possible bug, in prepare_to_relocate(), check if
    btrfs_commit_transaction() fails. If the failure occurs,
    unset_reloc_control() is called to set fs_info->reloc_ctl to NULL.

    The error log in our fault-injection testing is shown as follows:

      [   58.751070] BUG: KASAN: use-after-free in btrfs_init_reloc_root+0x7ca/0x920 [btrfs]
      ...
      [   58.753577] Call Trace:
      ...
      [   58.755800]  kasan_report+0x45/0x60
      [   58.756066]  btrfs_init_reloc_root+0x7ca/0x920 [btrfs]
      [   58.757304]  record_root_in_trans+0x792/0xa10 [btrfs]
      [   58.757748]  btrfs_record_root_in_trans+0x463/0x4f0 [btrfs]
      [   58.758231]  start_transaction+0x896/0x2950 [btrfs]
      [   58.758661]  btrfs_defrag_root+0x250/0xc00 [btrfs]
      [   58.759083]  btrfs_ioctl_defrag+0x467/0xa00 [btrfs]
      [   58.759513]  btrfs_ioctl+0x3c95/0x114e0 [btrfs]
      ...
      [   58.768510] Allocated by task 23683:
      [   58.768777]  ____kasan_kmalloc+0xb5/0xf0
      [   58.769069]  __kmalloc+0x227/0x3d0
      [   58.769325]  alloc_reloc_control+0x10a/0x3d0 [btrfs]
      [   58.769755]  btrfs_relocate_block_group+0x7aa/0x1e20 [btrfs]
      [   58.770228]  btrfs_relocate_chunk+0xf1/0x760 [btrfs]
      [   58.770655]  __btrfs_balance+0x1326/0x1f10 [btrfs]
      [   58.771071]  btrfs_balance+0x3150/0x3d30 [btrfs]
      [   58.771472]  btrfs_ioctl_balance+0xd84/0x1410 [btrfs]
      [   58.771902]  btrfs_ioctl+0x4caa/0x114e0 [btrfs]
      ...
      [   58.773337] Freed by task 23683:
      ...
      [   58.774815]  kfree+0xda/0x2b0
      [   58.775038]  free_reloc_control+0x1d6/0x220 [btrfs]
      [   58.775465]  btrfs_relocate_block_group+0x115c/0x1e20 [btrfs]
      [   58.775944]  btrfs_relocate_chunk+0xf1/0x760 [btrfs]
      [   58.776369]  __btrfs_balance+0x1326/0x1f10 [btrfs]
      [   58.776784]  btrfs_balance+0x3150/0x3d30 [btrfs]
      [   58.777185]  btrfs_ioctl_balance+0xd84/0x1410 [btrfs]
      [   58.777621]  btrfs_ioctl+0x4caa/0x114e0 [btrfs]
      ...

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-2025-993031
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?822d2316");
  # https://lore.kernel.org/linux-cve-announce/2025061852-CVE-2022-50067-a06c@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1854025d");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50067");
  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:C/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-2022-50067");

  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:"2023/06/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/31");

  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:"^20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060a / 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': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', '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');
}