Unity Linux 20.1050e / 20.1060e Security Update: kernel (UTSA-2026-007346)

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

include('compat.inc');

if (description)
{
  script_id(307321);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2025-40100");

  script_name(english:"Unity Linux 20.1050e / 20.1060e Security Update: kernel (UTSA-2026-007346)");

  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-2026-007346 advisory.

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

    btrfs: do not assert we found block group item when creating free space tree

    Currently, when building a free space tree at populate_free_space_tree(),
    if we are not using the block group tree feature, we always expect to find
    block group items (either extent items or a block group item with key type
    BTRFS_BLOCK_GROUP_ITEM_KEY) when we search the extent tree with
    btrfs_search_slot_for_read(), so we assert that we found an item. However
    this expectation is wrong since we can have a new block group created in
    the current transaction which is still empty and for which we still have
    not added the block group's item to the extent tree, in which case we do
    not have any items in the extent tree associated to the block group.

    The insertion of a new block group's block group item in the extent tree
    happens at btrfs_create_pending_block_groups() when it calls the helper
    insert_block_group_item(). This typically is done when a transaction
    handle is released, committed or when running delayed refs (either as
    part of a transaction commit or when serving tickets for space reservation
    if we are low on free space).

    So remove the assertion at populate_free_space_tree() even when the block
    group tree feature is not enabled and update the comment to mention this
    case.

    Syzbot reported this with the following stack trace:

      BTRFS info (device loop3 state M): rebuilding free space tree
      assertion failed: ret == 0 :: 0, in fs/btrfs/free-space-tree.c:1115
      ------------[ cut here ]------------
      kernel BUG at fs/btrfs/free-space-tree.c:1115!
      Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
      CPU: 1 UID: 0 PID: 6352 Comm: syz.3.25 Not tainted syzkaller #0 PREEMPT(full)
      Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
      RIP: 0010:populate_free_space_tree+0x700/0x710 fs/btrfs/free-space-tree.c:1115
      Code: ff ff e8 d3 (...)
      RSP: 0018:ffffc9000430f780 EFLAGS: 00010246
      RAX: 0000000000000043 RBX: ffff88805b709630 RCX: fea61d0e2e79d000
      RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
      RBP: ffffc9000430f8b0 R08: ffffc9000430f4a7 R09: 1ffff92000861e94
      R10: dffffc0000000000 R11: fffff52000861e95 R12: 0000000000000001
      R13: 1ffff92000861f00 R14: dffffc0000000000 R15: 0000000000000000
      FS:  00007f424d9fe6c0(0000) GS:ffff888125afc000(0000) knlGS:0000000000000000
      CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      CR2: 00007fd78ad212c0 CR3: 0000000076d68000 CR4: 00000000003526f0
      Call Trace:
       <TASK>
       btrfs_rebuild_free_space_tree+0x1ba/0x6d0 fs/btrfs/free-space-tree.c:1364
       btrfs_start_pre_rw_mount+0x128f/0x1bf0 fs/btrfs/disk-io.c:3062
       btrfs_remount_rw fs/btrfs/super.c:1334 [inline]
       btrfs_reconfigure+0xaed/0x2160 fs/btrfs/super.c:1559
       reconfigure_super+0x227/0x890 fs/super.c:1076
       do_remount fs/namespace.c:3279 [inline]
       path_mount+0xd1a/0xfe0 fs/namespace.c:4027
       do_mount fs/namespace.c:4048 [inline]
       __do_sys_mount fs/namespace.c:4236 [inline]
       __se_sys_mount+0x313/0x410 fs/namespace.c:4213
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f
       RIP: 0033:0x7f424e39066a
      Code: d8 64 89 02 (...)
      RSP: 002b:00007f424d9fde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
      RAX: ffffffffffffffda RBX: 00007f424d9fdef0 RCX: 00007f424e39066a
      RDX: 0000200000000180 RSI: 0000200000000380 RDI: 0000000000000000
      RBP: 0000200000000180 R08: 00007f424d9fdef0 R09: 0000000000000020
      R10: 0000000000000020 R11: 0000000000000246 R12: 0000200000000380
      R13: 00007f424d9fdeb0 R14: 0000000000000000 R15: 00002000000002c0
       </TASK>
      Modules linked in:
      ---[ end trace 0000000000000000 ]---

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-2026-007346
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9c2d0383");
  # https://lore.kernel.org/linux-cve-announce/2025103017-CVE-2025-40100-73e5@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fb4fc267");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-40100");
  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-2025-40100");

  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:"2025/10/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/17");

  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|20.1060e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e / 20.1060e', '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-4.19.90-2211.5.0.0178.47', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.47', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.47', 'sp':'1050e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1060e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2305.1.0.0199.104', 'sp':'1060e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.104', 'sp':'1060e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.104', 'sp':'1060e', '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');
}