Unity Linux 20.1050e Security Update: kernel (UTSA-2026-005168)

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

include('compat.inc');

if (description)
{
  script_id(296950);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/27");

  script_cve_id("CVE-2024-56658");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-005168)");

  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-2026-005168 advisory.

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

    net: defer final 'struct net' free in netns dismantle

    Ilya reported a slab-use-after-free in dst_destroy [1]

    Issue is in xfrm6_net_init() and xfrm4_net_init() :

    They copy xfrm[46]_dst_ops_template into net->xfrm.xfrm[46]_dst_ops.

    But net structure might be freed before all the dst callbacks are
    called. So when dst_destroy() calls later :

    if (dst->ops->destroy)
        dst->ops->destroy(dst);

    dst->ops points to the old net->xfrm.xfrm[46]_dst_ops, which has been freed.

    See a relevant issue fixed in :

    ac888d58869b (net: do not delay dst_entries_add() in dst_release())

    A fix is to queue the 'struct net' to be freed after one
    another cleanup_net() round (and existing rcu_barrier())

    [1]

    BUG: KASAN: slab-use-after-free in dst_destroy (net/core/dst.c:112)
    Read of size 8 at addr ffff8882137ccab0 by task swapper/37/0
    Dec 03 05:46:18 kernel:
    CPU: 37 UID: 0 PID: 0 Comm: swapper/37 Kdump: loaded Not tainted 6.12.0 #67
    Hardware name: Red Hat KVM/RHEL, BIOS 1.16.1-1.el9 04/01/2014
    Call Trace:
     <IRQ>
    dump_stack_lvl (lib/dump_stack.c:124)
    print_address_description.constprop.0 (mm/kasan/report.c:378)
    ? dst_destroy (net/core/dst.c:112)
    print_report (mm/kasan/report.c:489)
    ? dst_destroy (net/core/dst.c:112)
    ? kasan_addr_to_slab (mm/kasan/common.c:37)
    kasan_report (mm/kasan/report.c:603)
    ? dst_destroy (net/core/dst.c:112)
    ? rcu_do_batch (kernel/rcu/tree.c:2567)
    dst_destroy (net/core/dst.c:112)
    rcu_do_batch (kernel/rcu/tree.c:2567)
    ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2491)
    ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4339 kernel/locking/lockdep.c:4406)
    rcu_core (kernel/rcu/tree.c:2825)
    handle_softirqs (kernel/softirq.c:554)
    __irq_exit_rcu (kernel/softirq.c:589 kernel/softirq.c:428 kernel/softirq.c:637)
    irq_exit_rcu (kernel/softirq.c:651)
    sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049)
     </IRQ>
     <TASK>
    asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702)
    RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92
    arch/x86/kernel/process.c:743)
    Code: 00 4d 29 c8 4c 01 c7 4c 29 c2 e9 6e ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90
    0f 00 2d c7 c9 27 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90
    RSP: 0018:ffff888100d2fe00 EFLAGS: 00000246
    RAX: 00000000001870ed RBX: 1ffff110201a5fc2 RCX: ffffffffb61a3e46
    RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb3d4d123
    RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed11c7e1835d
    R10: ffff888e3f0c1aeb R11: 0000000000000000 R12: 0000000000000000
    R13: ffff888100d20000 R14: dffffc0000000000 R15: 0000000000000000
    ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:148)
    ? cpuidle_idle_call (kernel/sched/idle.c:186)
    default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118)
    cpuidle_idle_call (kernel/sched/idle.c:186)
    ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168)
    ? lock_release (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5848)
    ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
    ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59)
    do_idle (kernel/sched/idle.c:326)
    cpu_startup_entry (kernel/sched/idle.c:423 (discriminator 1))
    start_secondary (arch/x86/kernel/smpboot.c:202 arch/x86/kernel/smpboot.c:282)
    ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:232)
    ? soft_restart_cpu (arch/x86/kernel/head_64.S:452)
    common_startup_64 (arch/x86/kernel/head_64.S:414)
     </TASK>
    Dec 03 05:46:18 kernel:
    Allocated by task 12184:
    kasan_save_stack (mm/kasan/common.c:48)
    kasan_save_track (./arch/x86/include/asm/current.h:49 mm/kasan/common.c:60 mm/kasan/common.c:69)
    __kasan_slab_alloc (mm/kasan/common.c:319 mm/kasan/common.c:345)
    kmem_cache_alloc_noprof (mm/slub.c:4085 mm/slub.c:4134 mm/slub.c:4141)
    copy_net_ns (net/core/net_namespace.c:421 net/core/net_namespace.c:480)
    create_new_namespaces
    ---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-2026-005168
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?491628f0");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-56658");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/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-2024-56658");

  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:"2024/12/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/27");

  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-4.19.90-2211.5.0.0178.47', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.47', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.47', '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');
}