Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098710)

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

include('compat.inc');

if (description)
{
  script_id(340384);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/26");

  script_cve_id("CVE-2025-38232");

  script_name(english:"Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098710)");

  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-2026-098710 advisory.

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

    NFSD: fix race between nfsd registration and exports_proc

    As of now nfsd calls create_proc_exports_entry() at start of init_nfsd
    and cleanup by remove_proc_entry() at last of exit_nfsd.

    Which causes kernel OOPs if there is race between below 2 operations:
    (i) exportfs -r
    (ii) mount -t nfsd none /proc/fs/nfsd

    for 5.4 kernel ARM64:

    CPU 1:
    el1_irq+0xbc/0x180
    arch_counter_get_cntvct+0x14/0x18
    running_clock+0xc/0x18
    preempt_count_add+0x88/0x110
    prep_new_page+0xb0/0x220
    get_page_from_freelist+0x2d8/0x1778
    __alloc_pages_nodemask+0x15c/0xef0
    __vmalloc_node_range+0x28c/0x478
    __vmalloc_node_flags_caller+0x8c/0xb0
    kvmalloc_node+0x88/0xe0
    nfsd_init_net+0x6c/0x108 [nfsd]
    ops_init+0x44/0x170
    register_pernet_operations+0x114/0x270
    register_pernet_subsys+0x34/0x50
    init_nfsd+0xa8/0x718 [nfsd]
    do_one_initcall+0x54/0x2e0

    CPU 2 :
    Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010

    PC is at : exports_net_open+0x50/0x68 [nfsd]

    Call trace:
    exports_net_open+0x50/0x68 [nfsd]
    exports_proc_open+0x2c/0x38 [nfsd]
    proc_reg_open+0xb8/0x198
    do_dentry_open+0x1c4/0x418
    vfs_open+0x38/0x48
    path_openat+0x28c/0xf18
    do_filp_open+0x70/0xe8
    do_sys_open+0x154/0x248

    Sometimes it crashes at exports_net_open() and sometimes cache_seq_next_rcu().

    and same is happening on latest 6.14 kernel as well:

    [    0.000000] Linux version 6.14.0-rc5-next-20250304-dirty
    ...
    [  285.455918] Unable to handle kernel paging request at virtual address 00001f4800001f48
    ...
    [  285.464902] pc : cache_seq_next_rcu+0x78/0xa4
    ...
    [  285.469695] Call trace:
    [  285.470083]  cache_seq_next_rcu+0x78/0xa4 (P)
    [  285.470488]  seq_read+0xe0/0x11c
    [  285.470675]  proc_reg_read+0x9c/0xf0
    [  285.470874]  vfs_read+0xc4/0x2fc
    [  285.471057]  ksys_read+0x6c/0xf4
    [  285.471231]  __arm64_sys_read+0x1c/0x28
    [  285.471428]  invoke_syscall+0x44/0x100
    [  285.471633]  el0_svc_common.constprop.0+0x40/0xe0
    [  285.471870]  do_el0_svc_compat+0x1c/0x34
    [  285.472073]  el0_svc_compat+0x2c/0x80
    [  285.472265]  el0t_32_sync_handler+0x90/0x140
    [  285.472473]  el0t_32_sync+0x19c/0x1a0
    [  285.472887] Code: f9400885 93407c23 937d7c27 11000421 (f86378a3)
    [  285.473422] ---[ end trace 0000000000000000 ]---

    It reproduced simply with below script:
    while [ 1 ]
    do
    /exportfs -r
    done &

    while [ 1 ]
    do
    insmod /nfsd.ko
    mount -t nfsd none /proc/fs/nfsd
    umount /proc/fs/nfsd
    rmmod nfsd
    done &

    So exporting interfaces to user space shall be done at last and
    cleanup at first place.

    With change there is no Kernel OOPs.

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-2026-098710
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?13dd76b5");
  # https://lore.kernel.org/linux-cve-announce/2025070429-CVE-2025-38232-8112@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d6201da7");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-38232");
  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-2025-38232");

  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:"2025/07/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/26");

  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:"^20.1050a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050a', '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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1050a',
    'pkgs': [
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', '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');
}