Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-386566)

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

include('compat.inc');

if (description)
{
  script_id(267152);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2024-40905");

  script_name(english:"Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-386566)");

  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-2025-386566 advisory.

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

    ipv6: fix possible race in __fib6_drop_pcpu_from()

    syzbot found a race in __fib6_drop_pcpu_from() [1]

    If compiler reads more than once (*ppcpu_rt),
    second read could read NULL, if another cpu clears
    the value in rt6_get_pcpu_route().

    Add a READ_ONCE() to prevent this race.

    Also add rcu_read_lock()/rcu_read_unlock() because
    we rely on RCU protection while dereferencing pcpu_rt.

    [1]

    Oops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] PREEMPT
    SMP KASAN PTI
    KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]
    CPU: 0 PID: 7543 Comm: kworker/u8:17 Not tainted 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
    Workqueue: netns cleanup_net
     RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10a/0x370 net/ipv6/ip6_fib.c:984
    Code: f8 48 c1 e8 03 80 3c 28 00 0f 85 16 02 00 00 4d 8b 3f 4d 85 ff 74 31 e8 74 a7 fa f7 49 8d bf 90 00
    00 00 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 1e 02 00 00 49 8b 87 90 00 00 00 48 8b 0c 24 48
    RSP: 0018:ffffc900040df070 EFLAGS: 00010206
    RAX: 0000000000000012 RBX: 0000000000000001 RCX: ffffffff89932e16
    RDX: ffff888049dd1e00 RSI: ffffffff89932d7c RDI: 0000000000000091
    RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000007
    R10: 0000000000000001 R11: 0000000000000006 R12: ffff88807fa080b8
    R13: fffffbfff1a9a07d R14: ffffed100ff41022 R15: 0000000000000001
    FS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000001b32c26000 CR3: 000000005d56e000 CR4: 00000000003526f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     <TASK>
      __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:966 [inline]
      fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline]
      fib6_purge_rt+0x7f2/0x9f0 net/ipv6/ip6_fib.c:1038
      fib6_del_route net/ipv6/ip6_fib.c:1998 [inline]
      fib6_del+0xa70/0x17b0 net/ipv6/ip6_fib.c:2043
      fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2205
      fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2127
      fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2175
      fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2255
      __fib6_clean_all+0x100/0x2d0 net/ipv6/ip6_fib.c:2271
      rt6_sync_down_dev net/ipv6/route.c:4906 [inline]
      rt6_disable_ip+0x7ed/0xa00 net/ipv6/route.c:4911
      addrconf_ifdown.isra.0+0x117/0x1b40 net/ipv6/addrconf.c:3855
      addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3778
      notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
      call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1992
      call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]
      call_netdevice_notifiers net/core/dev.c:2044 [inline]
      dev_close_many+0x333/0x6a0 net/core/dev.c:1585
      unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11193
      unregister_netdevice_many net/core/dev.c:11276 [inline]
      default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11759
      ops_exit_list+0x128/0x180 net/core/net_namespace.c:178
      cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640
      process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
      process_scheduled_works kernel/workqueue.c:3312 [inline]
      worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
      kthread+0x2c1/0x3a0 kernel/kthread.c:389
      ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
      ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

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-2025-386566
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?64354ba9");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-40905");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/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:H/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-2024-40905");

  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:"2024/04/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/08");
  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:"^20.1050a|20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050a / 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': '1050a',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.2', 'sp':'1050a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.2', 'sp':'1050a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.2', 'sp':'1050a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.34', 'sp':'1060a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.34', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.34', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-74.12', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.12', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.12', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.12', '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_NOTE,
      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');
}