Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102109)

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

include('compat.inc');

if (description)
{
  script_id(337301);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/18");

  script_cve_id("CVE-2025-38245");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102109)");

  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-2026-102109 advisory.

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

    atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().

    syzbot reported a warning below during atm_dev_register(). [0]

    Before creating a new device and procfs/sysfs for it, atm_dev_register()
    looks up a duplicated device by __atm_dev_lookup().  These operations are
    done under atm_dev_mutex.

    However, when removing a device in atm_dev_deregister(), it releases the
    mutex just after removing the device from the list that __atm_dev_lookup()
    iterates over.

    So, there will be a small race window where the device does not exist on
    the device list but procfs/sysfs are still not removed, triggering the
    splat.

    Let's hold the mutex until procfs/sysfs are removed in
    atm_dev_deregister().

    [0]:
    proc_dir_entry 'atm/atmtcp:0' already registered
    WARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377
    Modules linked in:
    CPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0
    PREEMPT(full)
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
    RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377
    Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8
    00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48
    RSP: 0018:ffffc9000466fa30 EFLAGS: 00010282
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248
    RDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001
    RBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140
    R13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444
    FS:  00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     <TASK>
     proc_create_data+0xbe/0x110 fs/proc/generic.c:585
     atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361
     atm_dev_register+0x46d/0x890 net/atm/resources.c:113
     atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369
     atmtcp_attach drivers/atm/atmtcp.c:403 [inline]
     atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464
     do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159
     sock_do_ioctl+0x115/0x280 net/socket.c:1190
     sock_ioctl+0x227/0x6b0 net/socket.c:1311
     vfs_ioctl fs/ioctl.c:51 [inline]
     __do_sys_ioctl fs/ioctl.c:907 [inline]
     __se_sys_ioctl fs/ioctl.c:893 [inline]
     __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    RIP: 0033:0x7f38b3b74459
    Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d
    89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
    RAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459
    RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005
    RBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f
    R10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac
    R13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b
     </TASK>

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-2026-102109
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?71ee0faf");
  script_set_attribute(attribute:"see_also", value:"https://atomgit.com/src-openeuler/kernel/issues/9551");
  # https://git.kernel.org/stable/c/26248d5d68c865b888d632162abbf8130645622c
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7a31afe8");
  # https://git.kernel.org/stable/c/2a8dcee649d12f69713f2589171a1caf6d4fa439
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?351235b9");
  # https://git.kernel.org/stable/c/4bb1bb438134d9ee6b97cc07289dd7c569092eec
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b60ec169");
  # https://git.kernel.org/stable/c/6922f1a048c090f10704bbef4a3a1e81932d2e0a
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?848a05cf");
  # https://git.kernel.org/stable/c/a433791aeaea6e84df709e0b9584b9bbe040cd1c
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bb28d7f8");
  # https://git.kernel.org/stable/c/ae539d963a17443ec54cba8a767e4ffa318264f4
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cb67579a");
  # https://git.kernel.org/stable/c/b2e40fcfe1575faaa548f87614006d3fe44c779e
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bc8395ec");
  # https://git.kernel.org/stable/c/cabed6ba92a9a8c09da02a3f20e32ecd80989896
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b75e4106");
  # https://lore.kernel.org/linux-cve-announce/2025070933-CVE-2025-38245-a430@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?26b0d644");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-38245");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-38245");
  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-2025-38245");

  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:"2025/07/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/18");

  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');
}