Unity Linux 20.1070e Security Update: kernel (UTSA-2026-005477)

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

include('compat.inc');

if (description)
{
  script_id(300536);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/04");

  script_cve_id("CVE-2022-49557");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2026-005477)");

  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-2026-005477 advisory.

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

    x86/fpu: KVM: Set the base guest FPU uABI size to sizeof(struct kvm_xsave)

    Set the starting uABI size of KVM's guest FPU to 'struct kvm_xsave',
    i.e. to KVM's historical uABI size.  When saving FPU state for usersapce,
    KVM (well, now the FPU) sets the FP+SSE bits in the XSAVE header even if
    the host doesn't support XSAVE.  Setting the XSAVE header allows the VM
    to be migrated to a host that does support XSAVE without the new host
    having to handle FPU state that may or may not be compatible with XSAVE.

    Setting the uABI size to the host's default size results in out-of-bounds
    writes (setting the FP+SSE bits) and data corruption (that is thankfully
    caught by KASAN) when running on hosts without XSAVE, e.g. on Core2 CPUs.

    WARN if the default size is larger than KVM's historical uABI size; all
    features that can push the FPU size beyond the historical size must be
    opt-in.

      ==================================================================
      BUG: KASAN: slab-out-of-bounds in fpu_copy_uabi_to_guest_fpstate+0x86/0x130
      Read of size 8 at addr ffff888011e33a00 by task qemu-build/681
      CPU: 1 PID: 681 Comm: qemu-build Not tainted 5.18.0-rc5-KASAN-amd64 #1
      Hardware name:  /DG35EC, BIOS ECG3510M.86A.0118.2010.0113.1426 01/13/2010
      Call Trace:
       <TASK>
       dump_stack_lvl+0x34/0x45
       print_report.cold+0x45/0x575
       kasan_report+0x9b/0xd0
       fpu_copy_uabi_to_guest_fpstate+0x86/0x130
       kvm_arch_vcpu_ioctl+0x72a/0x1c50 [kvm]
       kvm_vcpu_ioctl+0x47f/0x7b0 [kvm]
       __x64_sys_ioctl+0x5de/0xc90
       do_syscall_64+0x31/0x50
       entry_SYSCALL_64_after_hwframe+0x44/0xae
       </TASK>
      Allocated by task 0:
      (stack is not available)
      The buggy address belongs to the object at ffff888011e33800
       which belongs to the cache kmalloc-512 of size 512
      The buggy address is located 0 bytes to the right of
       512-byte region [ffff888011e33800, ffff888011e33a00)
      The buggy address belongs to the physical page:
      page:0000000089cd4adb refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e30
      head:0000000089cd4adb order:2 compound_mapcount:0 compound_pincount:0
      flags: 0x4000000000010200(slab|head|zone=1)
      raw: 4000000000010200 dead000000000100 dead000000000122 ffff888001041c80
      raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
      page dumped because: kasan: bad access detected
      Memory state around the buggy address:
       ffff888011e33900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ffff888011e33980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
      >ffff888011e33a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
       ffff888011e33a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
       ffff888011e33b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
      ==================================================================
      Disabling lock debugging due to kernel taint

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-2026-005477
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e2506dc9");
  # https://lore.kernel.org/linux-cve-announce/2025022617-CVE-2022-49557-f9a3@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?eaa65a2a");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49557");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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: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-2022-49557");

  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:"2022/11/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/04");

  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-5.10.0-79.7', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', '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');
}