Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989983)

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

include('compat.inc');

if (description)
{
  script_id(272626);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49341");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989983)");

  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-2025-989983 advisory.

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

    bpf, arm64: Clear prog->jited_len along prog->jited

    syzbot reported an illegal copy_to_user() attempt
    from bpf_prog_get_info_by_fd() [1]

    There was no repro yet on this bug, but I think
    that commit 0aef499f3172 (mm/usercopy: Detect vmalloc overruns)
    is exposing a prior bug in bpf arm64.

    bpf_prog_get_info_by_fd() looks at prog->jited_len
    to determine if the JIT image can be copied out to user space.

    My theory is that syzbot managed to get a prog where prog->jited_len
    has been set to 43, while prog->bpf_func has ben cleared.

    It is not clear why copy_to_user(uinsns, NULL, ulen) is triggering
    this particular warning.

    I thought find_vma_area(NULL) would not find a vm_struct.
    As we do not hold vmap_area_lock spinlock, it might be possible
    that the found vm_struct was garbage.

    [1]
    usercopy: Kernel memory exposure attempt detected from vmalloc (offset 792633534417210172, size 43)!
    kernel BUG at mm/usercopy.c:101!
    Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
    Modules linked in:
    CPU: 0 PID: 25002 Comm: syz-executor.1 Not tainted 5.18.0-syzkaller-10139-g8291eaafed36 #0
    Hardware name: linux,dummy-virt (DT)
    pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    pc : usercopy_abort+0x90/0x94 mm/usercopy.c:101
    lr : usercopy_abort+0x90/0x94 mm/usercopy.c:89
    sp : ffff80000b773a20
    x29: ffff80000b773a30 x28: faff80000b745000 x27: ffff80000b773b48
    x26: 0000000000000000 x25: 000000000000002b x24: 0000000000000000
    x23: 00000000000000e0 x22: ffff80000b75db67 x21: 0000000000000001
    x20: 000000000000002b x19: ffff80000b75db3c x18: 00000000fffffffd
    x17: 2820636f6c6c616d x16: 76206d6f72662064 x15: 6574636574656420
    x14: 74706d6574746120 x13: 2129333420657a69 x12: 73202c3237313031
    x11: 3237313434333533 x10: 3336323937207465 x9 : 657275736f707865
    x8 : ffff80000a30c550 x7 : ffff80000b773830 x6 : ffff80000b773830
    x5 : 0000000000000000 x4 : ffff00007fbbaa10 x3 : 0000000000000000
    x2 : 0000000000000000 x1 : f7ff000028fc0000 x0 : 0000000000000064
    Call trace:
     usercopy_abort+0x90/0x94 mm/usercopy.c:89
     check_heap_object mm/usercopy.c:186 [inline]
     __check_object_size mm/usercopy.c:252 [inline]
     __check_object_size+0x198/0x36c mm/usercopy.c:214
     check_object_size include/linux/thread_info.h:199 [inline]
     check_copy_size include/linux/thread_info.h:235 [inline]
     copy_to_user include/linux/uaccess.h:159 [inline]
     bpf_prog_get_info_by_fd.isra.0+0xf14/0xfdc kernel/bpf/syscall.c:3993
     bpf_obj_get_info_by_fd+0x12c/0x510 kernel/bpf/syscall.c:4253
     __sys_bpf+0x900/0x2150 kernel/bpf/syscall.c:4956
     __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
     __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
     __arm64_sys_bpf+0x28/0x40 kernel/bpf/syscall.c:5019
     __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
     invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52
     el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142
     do_el0_svc+0xa0/0xc0 arch/arm64/kernel/syscall.c:206
     el0_svc+0x44/0xb0 arch/arm64/kernel/entry-common.c:624
     el0t_64_sync_handler+0x1ac/0x1b0 arch/arm64/kernel/entry-common.c:642
     el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581
    Code: aa0003e3 d00038c0 91248000 97fff65f (d4210000)

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-2025-989983
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?98639909");
  # https://lore.kernel.org/linux-cve-announce/2025022641-CVE-2022-49341-b0e9@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c4ea8e18");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49341");
  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-2022-49341");

  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:"2022/07/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  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) 2025 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 && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}