Unity Linux 20.1050e Security Update: kernel (UTSA-2026-005179)

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

include('compat.inc');

if (description)
{
  script_id(296963);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/27");

  script_cve_id("CVE-2024-53052");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-005179)");

  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-2026-005179 advisory.

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

    io_uring/rw: fix missing NOWAIT check for O_DIRECT start write

    When io_uring starts a write, it'll call kiocb_start_write() to bump the
    super block rwsem, preventing any freezes from happening while that
    write is in-flight. The freeze side will grab that rwsem for writing,
    excluding any new writers from happening and waiting for existing writes
    to finish. But io_uring unconditionally uses kiocb_start_write(), which
    will block if someone is currently attempting to freeze the mount point.
    This causes a deadlock where freeze is waiting for previous writes to
    complete, but the previous writes cannot complete, as the task that is
    supposed to complete them is blocked waiting on starting a new write.
    This results in the following stuck trace showing that dependency with
    the write blocked starting a new write:

    task:fio             state:D stack:0     pid:886   tgid:886   ppid:876
    Call trace:
     __switch_to+0x1d8/0x348
     __schedule+0x8e8/0x2248
     schedule+0x110/0x3f0
     percpu_rwsem_wait+0x1e8/0x3f8
     __percpu_down_read+0xe8/0x500
     io_write+0xbb8/0xff8
     io_issue_sqe+0x10c/0x1020
     io_submit_sqes+0x614/0x2110
     __arm64_sys_io_uring_enter+0x524/0x1038
     invoke_syscall+0x74/0x268
     el0_svc_common.constprop.0+0x160/0x238
     do_el0_svc+0x44/0x60
     el0_svc+0x44/0xb0
     el0t_64_sync_handler+0x118/0x128
     el0t_64_sync+0x168/0x170
    INFO: task fsfreeze:7364 blocked for more than 15 seconds.
          Not tainted 6.12.0-rc5-00063-g76aaf945701c #7963

    with the attempting freezer stuck trying to grab the rwsem:

    task:fsfreeze        state:D stack:0     pid:7364  tgid:7364  ppid:995
    Call trace:
     __switch_to+0x1d8/0x348
     __schedule+0x8e8/0x2248
     schedule+0x110/0x3f0
     percpu_down_write+0x2b0/0x680
     freeze_super+0x248/0x8a8
     do_vfs_ioctl+0x149c/0x1b18
     __arm64_sys_ioctl+0xd0/0x1a0
     invoke_syscall+0x74/0x268
     el0_svc_common.constprop.0+0x160/0x238
     do_el0_svc+0x44/0x60
     el0_svc+0x44/0xb0
     el0t_64_sync_handler+0x118/0x128
     el0t_64_sync+0x168/0x170

    Fix this by having the io_uring side honor IOCB_NOWAIT, and only attempt a
    blocking grab of the super block rwsem if it isn't set. For normal issue
    where IOCB_NOWAIT would always be set, this returns -EAGAIN which will
    have io_uring core issue a blocking attempt of the write. That will in
    turn also get completions run, ensuring forward progress.

    Since freezing requires CAP_SYS_ADMIN in the first place, this isn't
    something that can be triggered by a regular user.

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-2026-005179
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4551a231");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-53052");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:M/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:H/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-2024-53052");

  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:"2024/11/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/27");

  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-4.19.90-2211.5.0.0178.47', '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}
    ]
  }
];

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');
}