Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-007293)

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

include('compat.inc');

if (description)
{
  script_id(306902);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2024-27399");

  script_name(english:"Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-007293)");

  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-2026-007293 advisory.

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

    Bluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout

    There is a race condition between l2cap_chan_timeout() and
    l2cap_chan_del(). When we use l2cap_chan_del() to delete the
    channel, the chan->conn will be set to null. But the conn could
    be dereferenced again in the mutex_lock() of l2cap_chan_timeout().
    As a result the null pointer dereference bug will happen. The
    KASAN report triggered by POC is shown below:

    [  472.074580] ==================================================================
    [  472.075284] BUG: KASAN: null-ptr-deref in mutex_lock+0x68/0xc0
    [  472.075308] Write of size 8 at addr 0000000000000158 by task kworker/0:0/7
    [  472.075308]
    [  472.075308] CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc5-00356-g78c0094a146b #36
    [  472.075308] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    rel-1.14.0-0-g155821a1990b-prebuilt.qemu4
    [  472.075308] Workqueue: events l2cap_chan_timeout
    [  472.075308] Call Trace:
    [  472.075308]  <TASK>
    [  472.075308]  dump_stack_lvl+0x137/0x1a0
    [  472.075308]  print_report+0x101/0x250
    [  472.075308]  ? __virt_addr_valid+0x77/0x160
    [  472.075308]  ? mutex_lock+0x68/0xc0
    [  472.075308]  kasan_report+0x139/0x170
    [  472.075308]  ? mutex_lock+0x68/0xc0
    [  472.075308]  kasan_check_range+0x2c3/0x2e0
    [  472.075308]  mutex_lock+0x68/0xc0
    [  472.075308]  l2cap_chan_timeout+0x181/0x300
    [  472.075308]  process_one_work+0x5d2/0xe00
    [  472.075308]  worker_thread+0xe1d/0x1660
    [  472.075308]  ? pr_cont_work+0x5e0/0x5e0
    [  472.075308]  kthread+0x2b7/0x350
    [  472.075308]  ? pr_cont_work+0x5e0/0x5e0
    [  472.075308]  ? kthread_blkcg+0xd0/0xd0
    [  472.075308]  ret_from_fork+0x4d/0x80
    [  472.075308]  ? kthread_blkcg+0xd0/0xd0
    [  472.075308]  ret_from_fork_asm+0x11/0x20
    [  472.075308]  </TASK>
    [  472.075308] ==================================================================
    [  472.094860] Disabling lock debugging due to kernel taint
    [  472.096136] BUG: kernel NULL pointer dereference, address: 0000000000000158
    [  472.096136] #PF: supervisor write access in kernel mode
    [  472.096136] #PF: error_code(0x0002) - not-present page
    [  472.096136] PGD 0 P4D 0
    [  472.096136] Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI
    [  472.096136] CPU: 0 PID: 7 Comm: kworker/0:0 Tainted: G    B              6.9.0-rc5-00356-g78c0094a146b
    #36
    [  472.096136] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    rel-1.14.0-0-g155821a1990b-prebuilt.qemu4
    [  472.096136] Workqueue: events l2cap_chan_timeout
    [  472.096136] RIP: 0010:mutex_lock+0x88/0xc0
    [  472.096136] Code: be 08 00 00 00 e8 f8 23 1f fd 4c 89 f7 be 08 00 00 00 e8 eb 23 1f fd 42 80 3c 23 00
    74 08 48 88
    [  472.096136] RSP: 0018:ffff88800744fc78 EFLAGS: 00000246
    [  472.096136] RAX: 0000000000000000 RBX: 1ffff11000e89f8f RCX: ffffffff8457c865
    [  472.096136] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88800744fc78
    [  472.096136] RBP: 0000000000000158 R08: ffff88800744fc7f R09: 1ffff11000e89f8f
    [  472.096136] R10: dffffc0000000000 R11: ffffed1000e89f90 R12: dffffc0000000000
    [  472.096136] R13: 0000000000000158 R14: ffff88800744fc78 R15: ffff888007405a00
    [  472.096136] FS:  0000000000000000(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000
    [  472.096136] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [  472.096136] CR2: 0000000000000158 CR3: 000000000da32000 CR4: 00000000000006f0
    [  472.096136] Call Trace:
    [  472.096136]  <TASK>
    [  472.096136]  ? __die_body+0x8d/0xe0
    [  472.096136]  ? page_fault_oops+0x6b8/0x9a0
    [  472.096136]  ? kernelmode_fixup_or_oops+0x20c/0x2a0
    [  472.096136]  ? do_user_addr_fault+0x1027/0x1340
    [  472.096136]  ? _printk+0x7a/0xa0
    [  472.096136]  ? mutex_lock+0x68/0xc0
    [  472.096136]  ? add_taint+0x42/0xd0
    [  472.096136]  ? exc_page_fault+0x6a/0x1b0
    [  472.096136]  ? asm_exc_page_fault+0x26/0x30
    [  472.096136]  ? mutex_lock+0x75/0xc0
    [  472.096136]  ? mutex_lock+0x88/0xc0
    [  472.096136]  ? mutex_lock+0x75/0xc0
    [  472.096136]  l2cap_chan_timeo
    ---truncated---

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-2026-007293
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c3e7d62c");
  # https://lore.kernel.org/linux-cve-announce/2024051300-CVE-2024-27399-afa8@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d9bdf71d");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-27399");
  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-2024-27399");

  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:"2024/05/13");
  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|20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e / 20.1060e / 20.1070e', '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 && 'sw_64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1050e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2211.5.0.0178.27', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.27', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.27', 'sp':'1050e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1060e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2305.1.0.0199.86', 'sp':'1060e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.86', 'sp':'1060e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.86', 'sp':'1060e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2407.1.0', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2407.1.0', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2407.1.0', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2407.1.0', 'sp':'1070e', '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');
}