Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102059)

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

include('compat.inc');

if (description)
{
  script_id(338551);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/21");

  script_cve_id("CVE-2025-68286");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102059)");

  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-2026-102059 advisory.

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

    drm/amd/display: Check NULL before accessing

    [WHAT]
    IGT kms_cursor_legacy's long-nonblocking-modeset-vs-cursor-atomic
    fails with NULL pointer dereference. This can be reproduced with
    both an eDP panel and a DP monitors connected.

     BUG: kernel NULL pointer dereference, address: 0000000000000000
     #PF: supervisor read access in kernel mode
     #PF: error_code(0x0000) - not-present page
     PGD 0 P4D 0
     Oops: Oops: 0000 [#1] SMP NOPTI
     CPU: 13 UID: 0 PID: 2960 Comm: kms_cursor_lega Not tainted
    6.16.0-99-custom #8 PREEMPT(voluntary)
     Hardware name: AMD ........
     RIP: 0010:dc_stream_get_scanoutpos+0x34/0x130 [amdgpu]
     Code: 57 4d 89 c7 41 56 49 89 ce 41 55 49 89 d5 41 54 49
     89 fc 53 48 83 ec 18 48 8b 87 a0 64 00 00 48 89 75 d0 48 c7 c6 e0 41 30
     c2 <48> 8b 38 48 8b 9f 68 06 00 00 e8 8d d7 fd ff 31 c0 48 81 c3 e0 02
     RSP: 0018:ffffd0f3c2bd7608 EFLAGS: 00010292
     RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffd0f3c2bd7668
     RDX: ffffd0f3c2bd7664 RSI: ffffffffc23041e0 RDI: ffff8b32494b8000
     RBP: ffffd0f3c2bd7648 R08: ffffd0f3c2bd766c R09: ffffd0f3c2bd7760
     R10: ffffd0f3c2bd7820 R11: 0000000000000000 R12: ffff8b32494b8000
     R13: ffffd0f3c2bd7664 R14: ffffd0f3c2bd7668 R15: ffffd0f3c2bd766c
     FS:  000071f631b68700(0000) GS:ffff8b399f114000(0000)
    knlGS:0000000000000000
     CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
     CR2: 0000000000000000 CR3: 00000001b8105000 CR4: 0000000000f50ef0
     PKRU: 55555554
     Call Trace:
     <TASK>
     dm_crtc_get_scanoutpos+0xd7/0x180 [amdgpu]
     amdgpu_display_get_crtc_scanoutpos+0x86/0x1c0 [amdgpu]
     ? __pfx_amdgpu_crtc_get_scanout_position+0x10/0x10[amdgpu]
     amdgpu_crtc_get_scanout_position+0x27/0x50 [amdgpu]
     drm_crtc_vblank_helper_get_vblank_timestamp_internal+0xf7/0x400
     drm_crtc_vblank_helper_get_vblank_timestamp+0x1c/0x30
     drm_crtc_get_last_vbltimestamp+0x55/0x90
     drm_crtc_next_vblank_start+0x45/0xa0
     drm_atomic_helper_wait_for_fences+0x81/0x1f0
     ...

    (cherry picked from commit 621e55f1919640acab25383362b96e65f2baea3c)

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-2026-102059
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9b8a6a59");
  # https://git.kernel.org/stable/c/09092269cb762378ca8b56024746b1a136761e0d
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?799feb05");
  # https://git.kernel.org/stable/c/109e9c92543f3105e8e1efd2c5e6b92ef55d5743
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f5205ac9");
  # https://git.kernel.org/stable/c/3ce62c189693e8ed7b3abe551802bbc67f3ace54
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4c7e153a");
  # https://git.kernel.org/stable/c/62150f1e7ec707da76ff353fb7db51fef9cd6557
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cab06256");
  # https://git.kernel.org/stable/c/781f2f32e9c19eb791b52af283c96f9a9677a7f2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ba0a504a");
  # https://git.kernel.org/stable/c/9d1a65cbe3ec5da3003c8434ac7a38dcdc958fd9
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bfcd6e65");
  # https://git.kernel.org/stable/c/f7cf491cd5b54b5a093bd3fdf76fa2860a7522bf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1cbcd625");
  # https://lore.kernel.org/linux-cve-announce/2025121638-CVE-2025-68286-cda3@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?774f4cd8");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-68286");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-68286");
  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:C/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:H/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-2025-68286");

  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:"2025/12/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/21");

  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:"^(20.1050e)([^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-4.19.90-2211.5.0.0178.67.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.67.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.67.uel20', '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');
}