Unity Linux 20.1050e Security Update: kernel (UTSA-2026-006754)

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

include('compat.inc');

if (description)
{
  script_id(305326);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/08");

  script_cve_id("CVE-2025-39883");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-006754)");

  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-2026-006754 advisory.

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

    mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory

    When I did memory failure tests, below panic occurs:

    page dumped because: VM_BUG_ON_PAGE(PagePoisoned(page))
    kernel BUG at include/linux/page-flags.h:616!
    Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
    CPU: 3 PID: 720 Comm: bash Not tainted 6.10.0-rc1-00195-g148743902568 #40
    RIP: 0010:unpoison_memory+0x2f3/0x590
    RSP: 0018:ffffa57fc8787d60 EFLAGS: 00000246
    RAX: 0000000000000037 RBX: 0000000000000009 RCX: ffff9be25fcdc9c8
    RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff9be25fcdc9c0
    RBP: 0000000000300000 R08: ffffffffb4956f88 R09: 0000000000009ffb
    R10: 0000000000000284 R11: ffffffffb4926fa0 R12: ffffe6b00c000000
    R13: ffff9bdb453dfd00 R14: 0000000000000000 R15: fffffffffffffffe
    FS:  00007f08f04e4740(0000) GS:ffff9be25fcc0000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000564787a30410 CR3: 000000010d4e2000 CR4: 00000000000006f0
    Call Trace:
     <TASK>
     unpoison_memory+0x2f3/0x590
     simple_attr_write_xsigned.constprop.0.isra.0+0xb3/0x110
     debugfs_attr_write+0x42/0x60
     full_proxy_write+0x5b/0x80
     vfs_write+0xd5/0x540
     ksys_write+0x64/0xe0
     do_syscall_64+0xb9/0x1d0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    RIP: 0033:0x7f08f0314887
    RSP: 002b:00007ffece710078 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
    RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f08f0314887
    RDX: 0000000000000009 RSI: 0000564787a30410 RDI: 0000000000000001
    RBP: 0000564787a30410 R08: 000000000000fefe R09: 000000007fffffff
    R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
    R13: 00007f08f041b780 R14: 00007f08f0417600 R15: 00007f08f0416a00
     </TASK>
    Modules linked in: hwpoison_inject
    ---[ end trace 0000000000000000 ]---
    RIP: 0010:unpoison_memory+0x2f3/0x590
    RSP: 0018:ffffa57fc8787d60 EFLAGS: 00000246
    RAX: 0000000000000037 RBX: 0000000000000009 RCX: ffff9be25fcdc9c8
    RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff9be25fcdc9c0
    RBP: 0000000000300000 R08: ffffffffb4956f88 R09: 0000000000009ffb
    R10: 0000000000000284 R11: ffffffffb4926fa0 R12: ffffe6b00c000000
    R13: ffff9bdb453dfd00 R14: 0000000000000000 R15: fffffffffffffffe
    FS:  00007f08f04e4740(0000) GS:ffff9be25fcc0000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000564787a30410 CR3: 000000010d4e2000 CR4: 00000000000006f0
    Kernel panic - not syncing: Fatal exception
    Kernel Offset: 0x31c00000 from 0xffffffff81000000 (relocation range:
    0xffffffff80000000-0xffffffffbfffffff)
    ---[ end Kernel panic - not syncing: Fatal exception ]---

    The root cause is that unpoison_memory() tries to check the PG_HWPoison
    flags of an uninitialized page.  So VM_BUG_ON_PAGE(PagePoisoned(page)) is
    triggered.  This can be reproduced by below steps:

    1.Offline memory block:

     echo offline > /sys/devices/system/memory/memory12/state

    2.Get offlined memory pfn:

     page-types -b n -rlN

    3.Write pfn to unpoison-pfn

     echo <pfn> > /sys/kernel/debug/hwpoison/unpoison-pfn

    This scenario can be identified by pfn_to_online_page() returning NULL.
    And ZONE_DEVICE pages are never expected, so we can simply fail if
    pfn_to_online_page() == NULL to fix the bug.

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-2026-006754
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c7c430aa");
  # https://lore.kernel.org/linux-cve-announce/2025092302-CVE-2025-39883-6015@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2cec4075");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-39883");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/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:H/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-2025-39883");

  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:"2025/09/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/08");

  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-5.10.0-27.5', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.5', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.5', '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_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');
}