Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013325)

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

include('compat.inc');

if (description)
{
  script_id(307933);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2023-54218");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013325)");

  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-2026-013325 advisory.

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

    net: Fix load-tearing on sk->sk_stamp in sock_recv_cmsgs().

    KCSAN found a data race in sock_recv_cmsgs() where the read access
    to sk->sk_stamp needs READ_ONCE().

    BUG: KCSAN: data-race in packet_recvmsg / packet_recvmsg

    write (marked) to 0xffff88803c81f258 of 8 bytes by task 19171 on cpu 0:
     sock_write_timestamp include/net/sock.h:2670 [inline]
     sock_recv_cmsgs include/net/sock.h:2722 [inline]
     packet_recvmsg+0xb97/0xd00 net/packet/af_packet.c:3489
     sock_recvmsg_nosec net/socket.c:1019 [inline]
     sock_recvmsg+0x11a/0x130 net/socket.c:1040
     sock_read_iter+0x176/0x220 net/socket.c:1118
     call_read_iter include/linux/fs.h:1845 [inline]
     new_sync_read fs/read_write.c:389 [inline]
     vfs_read+0x5e0/0x630 fs/read_write.c:470
     ksys_read+0x163/0x1a0 fs/read_write.c:613
     __do_sys_read fs/read_write.c:623 [inline]
     __se_sys_read fs/read_write.c:621 [inline]
     __x64_sys_read+0x41/0x50 fs/read_write.c:621
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x72/0xdc

    read to 0xffff88803c81f258 of 8 bytes by task 19183 on cpu 1:
     sock_recv_cmsgs include/net/sock.h:2721 [inline]
     packet_recvmsg+0xb64/0xd00 net/packet/af_packet.c:3489
     sock_recvmsg_nosec net/socket.c:1019 [inline]
     sock_recvmsg+0x11a/0x130 net/socket.c:1040
     sock_read_iter+0x176/0x220 net/socket.c:1118
     call_read_iter include/linux/fs.h:1845 [inline]
     new_sync_read fs/read_write.c:389 [inline]
     vfs_read+0x5e0/0x630 fs/read_write.c:470
     ksys_read+0x163/0x1a0 fs/read_write.c:613
     __do_sys_read fs/read_write.c:623 [inline]
     __se_sys_read fs/read_write.c:621 [inline]
     __x64_sys_read+0x41/0x50 fs/read_write.c:621
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x72/0xdc

    value changed: 0xffffffffc4653600 -> 0x0000000000000000

    Reported by Kernel Concurrency Sanitizer on:
    CPU: 1 PID: 19183 Comm: syz-executor.5 Not tainted 6.3.0-rc7-02330-gca6270c12e20 #2
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org
    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-2026-013325
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5d594ae7");
  # https://lore.kernel.org/linux-cve-announce/2025123026-CVE-2023-54218-840c@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fcaaf75b");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-54218");
  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:P/A:P");
  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:L/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-54218");

  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_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');
}