Unity Linux 20.1050e Security Update: kernel (UTSA-2026-021640)

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

include('compat.inc');

if (description)
{
  script_id(315885);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/20");

  script_cve_id("CVE-2024-36927");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-021640)");

  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-2026-021640 advisory.

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

    ipv4: Fix uninit-value access in __ip_make_skb()

    KMSAN reported uninit-value access in __ip_make_skb() [1].  __ip_make_skb()
    tests HDRINCL to know if the skb has icmphdr. However, HDRINCL can cause a
    race condition. If calling setsockopt(2) with IP_HDRINCL changes HDRINCL
    while __ip_make_skb() is running, the function will access icmphdr in the
    skb even if it is not included. This causes the issue reported by KMSAN.

    Check FLOWI_FLAG_KNOWN_NH on fl4->flowi4_flags instead of testing HDRINCL
    on the socket.

    Also, fl4->fl4_icmp_type and fl4->fl4_icmp_code are not initialized. These
    are union in struct flowi4 and are implicitly initialized by
    flowi4_init_output(), but we should not rely on specific union layout.

    Initialize these explicitly in raw_sendmsg().

    [1]
    BUG: KMSAN: uninit-value in __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481
     __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481
     ip_finish_skb include/net/ip.h:243 [inline]
     ip_push_pending_frames+0x4c/0x5c0 net/ipv4/ip_output.c:1508
     raw_sendmsg+0x2381/0x2690 net/ipv4/raw.c:654
     inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x274/0x3c0 net/socket.c:745
     __sys_sendto+0x62c/0x7b0 net/socket.c:2191
     __do_sys_sendto net/socket.c:2203 [inline]
     __se_sys_sendto net/socket.c:2199 [inline]
     __x64_sys_sendto+0x130/0x200 net/socket.c:2199
     do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x6d/0x75

    Uninit was created at:
     slab_post_alloc_hook mm/slub.c:3804 [inline]
     slab_alloc_node mm/slub.c:3845 [inline]
     kmem_cache_alloc_node+0x5f6/0xc50 mm/slub.c:3888
     kmalloc_reserve+0x13c/0x4a0 net/core/skbuff.c:577
     __alloc_skb+0x35a/0x7c0 net/core/skbuff.c:668
     alloc_skb include/linux/skbuff.h:1318 [inline]
     __ip_append_data+0x49ab/0x68c0 net/ipv4/ip_output.c:1128
     ip_append_data+0x1e7/0x260 net/ipv4/ip_output.c:1365
     raw_sendmsg+0x22b1/0x2690 net/ipv4/raw.c:648
     inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x274/0x3c0 net/socket.c:745
     __sys_sendto+0x62c/0x7b0 net/socket.c:2191
     __do_sys_sendto net/socket.c:2203 [inline]
     __se_sys_sendto net/socket.c:2199 [inline]
     __x64_sys_sendto+0x130/0x200 net/socket.c:2199
     do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x6d/0x75

    CPU: 1 PID: 15709 Comm: syz-executor.7 Not tainted 6.8.0-11567-gb3603fcb79b1 #25
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-1.fc39 04/01/2014

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-2026-021640
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?83c52398");
  # https://lore.kernel.org/linux-cve-announce/2024053040-CVE-2024-36927-976e@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cae63a64");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-36927");
  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-2024-36927");

  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:"2024/05/30");
  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_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');
}