Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986348)

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

include('compat.inc');

if (description)
{
  script_id(269171);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2022-49567");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986348)");

  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-2025-986348 advisory.

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

    mm/mempolicy: fix uninit-value in mpol_rebind_policy()

    mpol_set_nodemask()(mm/mempolicy.c) does not set up nodemask when
    pol->mode is MPOL_LOCAL.  Check pol->mode before access
    pol->w.cpuset_mems_allowed in mpol_rebind_policy()(mm/mempolicy.c).

    BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:352 [inline]
    BUG: KMSAN: uninit-value in mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368
     mpol_rebind_policy mm/mempolicy.c:352 [inline]
     mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368
     cpuset_change_task_nodemask kernel/cgroup/cpuset.c:1711 [inline]
     cpuset_attach+0x787/0x15e0 kernel/cgroup/cpuset.c:2278
     cgroup_migrate_execute+0x1023/0x1d20 kernel/cgroup/cgroup.c:2515
     cgroup_migrate kernel/cgroup/cgroup.c:2771 [inline]
     cgroup_attach_task+0x540/0x8b0 kernel/cgroup/cgroup.c:2804
     __cgroup1_procs_write+0x5cc/0x7a0 kernel/cgroup/cgroup-v1.c:520
     cgroup1_tasks_write+0x94/0xb0 kernel/cgroup/cgroup-v1.c:539
     cgroup_file_write+0x4c2/0x9e0 kernel/cgroup/cgroup.c:3852
     kernfs_fop_write_iter+0x66a/0x9f0 fs/kernfs/file.c:296
     call_write_iter include/linux/fs.h:2162 [inline]
     new_sync_write fs/read_write.c:503 [inline]
     vfs_write+0x1318/0x2030 fs/read_write.c:590
     ksys_write+0x28b/0x510 fs/read_write.c:643
     __do_sys_write fs/read_write.c:655 [inline]
     __se_sys_write fs/read_write.c:652 [inline]
     __x64_sys_write+0xdb/0x120 fs/read_write.c:652
     do_syscall_x64 arch/x86/entry/common.c:51 [inline]
     do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
     entry_SYSCALL_64_after_hwframe+0x44/0xae

    Uninit was created at:
     slab_post_alloc_hook mm/slab.h:524 [inline]
     slab_alloc_node mm/slub.c:3251 [inline]
     slab_alloc mm/slub.c:3259 [inline]
     kmem_cache_alloc+0x902/0x11c0 mm/slub.c:3264
     mpol_new mm/mempolicy.c:293 [inline]
     do_set_mempolicy+0x421/0xb70 mm/mempolicy.c:853
     kernel_set_mempolicy mm/mempolicy.c:1504 [inline]
     __do_sys_set_mempolicy mm/mempolicy.c:1510 [inline]
     __se_sys_set_mempolicy+0x44c/0xb60 mm/mempolicy.c:1507
     __x64_sys_set_mempolicy+0xd8/0x110 mm/mempolicy.c:1507
     do_syscall_x64 arch/x86/entry/common.c:51 [inline]
     do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
     entry_SYSCALL_64_after_hwframe+0x44/0xae

    KMSAN: uninit-value in mpol_rebind_task (2)
    https://syzkaller.appspot.com/bug?id=d6eb90f952c2a5de9ea718a1b873c55cb13b59dc

    This patch seems to fix below bug too.
    KMSAN: uninit-value in mpol_rebind_mm (2)
    https://syzkaller.appspot.com/bug?id=f2fecd0d7013f54ec4162f60743a2b28df40926b

    The uninit-value is pol->w.cpuset_mems_allowed in mpol_rebind_policy().
    When syzkaller reproducer runs to the beginning of mpol_new(),

                mpol_new() mm/mempolicy.c
              do_mbind() mm/mempolicy.c
            kernel_mbind() mm/mempolicy.c

    `mode` is 1(MPOL_PREFERRED), nodes_empty(*nodes) is `true` and `flags`
    is 0. Then

            mode = MPOL_LOCAL;
            ...
            policy->mode = mode;
            policy->flags = flags;

    will be executed. So in mpol_set_nodemask(),

                mpol_set_nodemask() mm/mempolicy.c
              do_mbind()
            kernel_mbind()

    pol->mode is 4 (MPOL_LOCAL), that `nodemask` in `pol` is not initialized,
    which will be accessed in mpol_rebind_policy().

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-2025-986348
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?da29cda8");
  # https://lore.kernel.org/linux-cve-announce/2025022606-CVE-2022-49567-6118@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6230e102");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49567");
  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-2022-49567");

  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:"2023/11/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/07");

  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-4.19.90-2403.3.0.0270.103.002', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2403.3.0.0270.103.002', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2403.3.0.0270.103.002', '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');
}