Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013240)

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

include('compat.inc');

if (description)
{
  script_id(307958);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2023-54004");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013240)");

  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-2026-013240 advisory.

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

    udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated().

    syzbot reported [0] a null-ptr-deref in sk_get_rmem0() while using
    IPPROTO_UDPLITE (0x88):

      14:25:52 executing program 1:
      r0 = socket$inet6(0xa, 0x80002, 0x88)

    We had a similar report [1] for probably sk_memory_allocated_add()
    in __sk_mem_raise_allocated(), and commit c915fe13cbaa (udplite: fix
    NULL pointer dereference) fixed it by setting .memory_allocated for
    udplite_prot and udplitev6_prot.

    To fix the variant, we need to set either .sysctl_wmem_offset or
    .sysctl_rmem.

    Now UDP and UDPLITE share the same value for .memory_allocated, so we
    use the same .sysctl_wmem_offset for UDP and UDPLITE.

    [0]:
    general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP
    KASAN
    KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
    CPU: 0 PID: 6829 Comm: syz-executor.1 Not tainted 6.4.0-rc2-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
    RIP: 0010:sk_get_rmem0 include/net/sock.h:2907 [inline]
    RIP: 0010:__sk_mem_raise_allocated+0x806/0x17a0 net/core/sock.c:3006
    Code: c1 ea 03 80 3c 02 00 0f 85 23 0f 00 00 48 8b 44 24 08 48 8b 98 38 01 00 00 48 b8 00 00 00 00 00 fc
    ff df 48 89 da 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 0f 8d 6f 0a 00 00 8b
    RSP: 0018:ffffc90005d7f450 EFLAGS: 00010246
    RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90004d92000
    RDX: 0000000000000000 RSI: ffffffff88066482 RDI: ffffffff8e2ccbb8
    RBP: ffff8880173f7000 R08: 0000000000000005 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000030000
    R13: 0000000000000001 R14: 0000000000000340 R15: 0000000000000001
    FS:  0000000000000000(0000) GS:ffff8880b9800000(0063) knlGS:00000000f7f1cb40
    CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
    CR2: 000000002e82f000 CR3: 0000000034ff0000 CR4: 00000000003506f0
    Call Trace:
     <TASK>
     __sk_mem_schedule+0x6c/0xe0 net/core/sock.c:3077
     udp_rmem_schedule net/ipv4/udp.c:1539 [inline]
     __udp_enqueue_schedule_skb+0x776/0xb30 net/ipv4/udp.c:1581
     __udpv6_queue_rcv_skb net/ipv6/udp.c:666 [inline]
     udpv6_queue_rcv_one_skb+0xc39/0x16c0 net/ipv6/udp.c:775
     udpv6_queue_rcv_skb+0x194/0xa10 net/ipv6/udp.c:793
     __udp6_lib_mcast_deliver net/ipv6/udp.c:906 [inline]
     __udp6_lib_rcv+0x1bda/0x2bd0 net/ipv6/udp.c:1013
     ip6_protocol_deliver_rcu+0x2e7/0x1250 net/ipv6/ip6_input.c:437
     ip6_input_finish+0x150/0x2f0 net/ipv6/ip6_input.c:482
     NF_HOOK include/linux/netfilter.h:303 [inline]
     NF_HOOK include/linux/netfilter.h:297 [inline]
     ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:491
     ip6_mc_input+0x40b/0xf50 net/ipv6/ip6_input.c:585
     dst_input include/net/dst.h:468 [inline]
     ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
     NF_HOOK include/linux/netfilter.h:303 [inline]
     NF_HOOK include/linux/netfilter.h:297 [inline]
     ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309
     __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491
     __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605
     netif_receive_skb_internal net/core/dev.c:5691 [inline]
     netif_receive_skb+0x133/0x7a0 net/core/dev.c:5750
     tun_rx_batched+0x4b3/0x7a0 drivers/net/tun.c:1553
     tun_get_user+0x2452/0x39c0 drivers/net/tun.c:1989
     tun_chr_write_iter+0xdf/0x200 drivers/net/tun.c:2035
     call_write_iter include/linux/fs.h:1868 [inline]
     new_sync_write fs/read_write.c:491 [inline]
     vfs_write+0x945/0xd50 fs/read_write.c:584
     ksys_write+0x12b/0x250 fs/read_write.c:637
     do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
     __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
     do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
     entry_SYSENTER_compat_after_hwframe+0x70/0x82
    RIP: 0023:0xf7f21579
    Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00
    51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
    ---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-2026-013240
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?95035ccc");
  # https://lore.kernel.org/linux-cve-announce/2025122428-CVE-2023-54004-34a0@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d12271c4");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-54004");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/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-2023-54004");

  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:"2021/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/21");

  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:"^20.1070e([^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 && 'sw_64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2307.3.0', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2307.3.0', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2307.3.0', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2307.3.0', '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');
}