Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013373)

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

include('compat.inc');

if (description)
{
  script_id(308029);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2023-54142");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013373)");

  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-2026-013373 advisory.

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

    gtp: Fix use-after-free in __gtp_encap_destroy().

    syzkaller reported use-after-free in __gtp_encap_destroy(). [0]

    It shows the same process freed sk and touched it illegally.

    Commit e198987e7dd7 (gtp: fix suspicious RCU usage) added lock_sock()
    and release_sock() in __gtp_encap_destroy() to protect sk->sk_user_data,
    but release_sock() is called after sock_put() releases the last refcnt.

    [0]:
    BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
    BUG: KASAN: slab-use-after-free in atomic_try_cmpxchg_acquire include/linux/atomic/atomic-
    instrumented.h:541 [inline]
    BUG: KASAN: slab-use-after-free in queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
    BUG: KASAN: slab-use-after-free in do_raw_spin_lock include/linux/spinlock.h:186 [inline]
    BUG: KASAN: slab-use-after-free in __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline]
    BUG: KASAN: slab-use-after-free in _raw_spin_lock_bh+0x75/0xe0 kernel/locking/spinlock.c:178
    Write of size 4 at addr ffff88800dbef398 by task syz-executor.2/2401

    CPU: 1 PID: 2401 Comm: syz-executor.2 Not tainted 6.4.0-rc5-01219-gfa0e21fa4443 #2
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org
    04/01/2014
    Call Trace:
     <TASK>
     __dump_stack lib/dump_stack.c:88 [inline]
     dump_stack_lvl+0x72/0xa0 lib/dump_stack.c:106
     print_address_description mm/kasan/report.c:351 [inline]
     print_report+0xcc/0x620 mm/kasan/report.c:462
     kasan_report+0xb2/0xe0 mm/kasan/report.c:572
     check_region_inline mm/kasan/generic.c:181 [inline]
     kasan_check_range+0x39/0x1c0 mm/kasan/generic.c:187
     instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
     atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:541 [inline]
     queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
     do_raw_spin_lock include/linux/spinlock.h:186 [inline]
     __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline]
     _raw_spin_lock_bh+0x75/0xe0 kernel/locking/spinlock.c:178
     spin_lock_bh include/linux/spinlock.h:355 [inline]
     release_sock+0x1f/0x1a0 net/core/sock.c:3526
     gtp_encap_disable_sock drivers/net/gtp.c:651 [inline]
     gtp_encap_disable+0xb9/0x220 drivers/net/gtp.c:664
     gtp_dev_uninit+0x19/0x50 drivers/net/gtp.c:728
     unregister_netdevice_many_notify+0x97e/0x1520 net/core/dev.c:10841
     rtnl_delete_link net/core/rtnetlink.c:3216 [inline]
     rtnl_dellink+0x3c0/0xb30 net/core/rtnetlink.c:3268
     rtnetlink_rcv_msg+0x450/0xb10 net/core/rtnetlink.c:6423
     netlink_rcv_skb+0x15d/0x450 net/netlink/af_netlink.c:2548
     netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
     netlink_unicast+0x700/0x930 net/netlink/af_netlink.c:1365
     netlink_sendmsg+0x91c/0xe30 net/netlink/af_netlink.c:1913
     sock_sendmsg_nosec net/socket.c:724 [inline]
     sock_sendmsg+0x1b7/0x200 net/socket.c:747
     ____sys_sendmsg+0x75a/0x990 net/socket.c:2493
     ___sys_sendmsg+0x11d/0x1c0 net/socket.c:2547
     __sys_sendmsg+0xfe/0x1d0 net/socket.c:2576
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x3f/0x90 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x72/0xdc
    RIP: 0033:0x7f1168b1fe5d
    Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d
    89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48
    RSP: 002b:00007f1167edccc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
    RAX: ffffffffffffffda RBX: 00000000004bbf80 RCX: 00007f1168b1fe5d
    RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000003
    RBP: 00000000004bbf80 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
    R13: 000000000000000b R14: 00007f1168b80530 R15: 0000000000000000
     </TASK>

    Allocated by task 1483:
     kasan_save_stack+0x22/0x50 mm/kasan/common.c:45
     kasan_set_track+0x25/0x30 mm/kasan/common.c:52
     __kasan_slab_alloc+0x
    ---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-2026-013373
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?006592cf");
  # https://lore.kernel.org/linux-cve-announce/2025122423-CVE-2023-54142-fd19@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c2942672");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-54142");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/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:H/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-2023-54142");

  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-4.19.90-2407.1.0', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2407.1.0', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2407.1.0', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2407.1.0', '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');
}