Unity Linux 20.1050e Security Update: kernel (UTSA-2026-021599)

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

include('compat.inc');

if (description)
{
  script_id(315812);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/20");

  script_cve_id("CVE-2024-47707");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-021599)");

  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-2026-021599 advisory.

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

    ipv6: avoid possible NULL deref in rt6_uncached_list_flush_dev()

    Blamed commit accidentally removed a check for rt->rt6i_idev being NULL,
    as spotted by syzbot:

    Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT
    SMP KASAN PTI
    KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
    CPU: 1 UID: 0 PID: 10998 Comm: syz-executor Not tainted 6.11.0-rc6-syzkaller-00208-g625403177711 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
     RIP: 0010:rt6_uncached_list_flush_dev net/ipv6/route.c:177 [inline]
     RIP: 0010:rt6_disable_ip+0x33e/0x7e0 net/ipv6/route.c:4914
    Code: 41 80 3c 04 00 74 0a e8 90 d0 9b f7 48 8b 7c 24 08 48 8b 07 48 89 44 24 10 4c 89 f0 48 c1 e8 03 48
    b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 64 d0 9b f7 48 8b 44 24 18 49 39 06
    RSP: 0018:ffffc900047374e0 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 1ffff1100fdf8f33 RCX: dffffc0000000000
    RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807efc78c0
    RBP: ffffc900047375d0 R08: 0000000000000003 R09: fffff520008e6e8c
    R10: dffffc0000000000 R11: fffff520008e6e8c R12: 1ffff1100fdf8f18
    R13: ffff88807efc7998 R14: 0000000000000000 R15: ffff88807efc7930
    FS:  0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000020002a80 CR3: 0000000022f62000 CR4: 00000000003506f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     <TASK>
      addrconf_ifdown+0x15d/0x1bd0 net/ipv6/addrconf.c:3856
     addrconf_notify+0x3cb/0x1020
      notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
      call_netdevice_notifiers_extack net/core/dev.c:2032 [inline]
      call_netdevice_notifiers net/core/dev.c:2046 [inline]
      unregister_netdevice_many_notify+0xd81/0x1c40 net/core/dev.c:11352
      unregister_netdevice_many net/core/dev.c:11414 [inline]
      unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11289
      unregister_netdevice include/linux/netdevice.h:3129 [inline]
      __tun_detach+0x6b9/0x1600 drivers/net/tun.c:685
      tun_detach drivers/net/tun.c:701 [inline]
      tun_chr_close+0x108/0x1b0 drivers/net/tun.c:3510
      __fput+0x24a/0x8a0 fs/file_table.c:422
      task_work_run+0x24f/0x310 kernel/task_work.c:228
      exit_task_work include/linux/task_work.h:40 [inline]
      do_exit+0xa2f/0x27f0 kernel/exit.c:882
      do_group_exit+0x207/0x2c0 kernel/exit.c:1031
      __do_sys_exit_group kernel/exit.c:1042 [inline]
      __se_sys_exit_group kernel/exit.c:1040 [inline]
      __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
      x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
      do_syscall_x64 arch/x86/entry/common.c:52 [inline]
      do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    RIP: 0033:0x7f1acc77def9
    Code: Unable to access opcode bytes at 0x7f1acc77decf.
    RSP: 002b:00007ffeb26fa738 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
    RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1acc77def9
    RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
    RBP: 00007f1acc7dd508 R08: 00007ffeb26f84d7 R09: 0000000000000003
    R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
    R13: 0000000000000003 R14: 00000000ffffffff R15: 00007ffeb26fa8e0
     </TASK>
    Modules linked in:
    ---[ end trace 0000000000000000 ]---
     RIP: 0010:rt6_uncached_list_flush_dev net/ipv6/route.c:177 [inline]
     RIP: 0010:rt6_disable_ip+0x33e/0x7e0 net/ipv6/route.c:4914
    Code: 41 80 3c 04 00 74 0a e8 90 d0 9b f7 48 8b 7c 24 08 48 8b 07 48 89 44 24 10 4c 89 f0 48 c1 e8 03 48
    b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 64 d0 9b f7 48 8b 44 24 18 49 39 06
    RSP: 0018:ffffc900047374e0 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 1ffff1100fdf8f33 RCX: dffffc0000000000
    RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807efc78c0
    R
    ---truncated---

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-2026-021599
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?37cf991a");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-47707");
  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-2024-47707");

  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:"2023/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/20");

  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) 2026 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:"^20.1050e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e', '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': '1050e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2211.5.0.0178.56.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.56.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.56.uel20', 'sp':'1050e', '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');
}