Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992846)

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

include('compat.inc');

if (description)
{
  script_id(281175);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/31");

  script_cve_id("CVE-2022-49998");

  script_name(english:"Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992846)");

  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-2025-992846 advisory.

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

    rxrpc: Fix locking in rxrpc's sendmsg

    Fix three bugs in the rxrpc's sendmsg implementation:

     (1) rxrpc_new_client_call() should release the socket lock when returning
         an error from rxrpc_get_call_slot().

     (2) rxrpc_wait_for_tx_window_intr() will return without the call mutex
         held in the event that we're interrupted by a signal whilst waiting
         for tx space on the socket or relocking the call mutex afterwards.

         Fix this by: (a) moving the unlock/lock of the call mutex up to
         rxrpc_send_data() such that the lock is not held around all of
         rxrpc_wait_for_tx_window*() and (b) indicating to higher callers
         whether we're return with the lock dropped.  Note that this means
         recvmsg() will not block on this call whilst we're waiting.

     (3) After dropping and regaining the call mutex, rxrpc_send_data() needs
         to go and recheck the state of the tx_pending buffer and the
         tx_total_len check in case we raced with another sendmsg() on the same
         call.

    Thinking on this some more, it might make sense to have different locks for
    sendmsg() and recvmsg().  There's probably no need to make recvmsg() wait
    for sendmsg().  It does mean that recvmsg() can return MSG_EOR indicating
    that a call is dead before a sendmsg() to that call returns - but that can
    currently happen anyway.

    Without fix (2), something like the following can be induced:

            WARNING: bad unlock balance detected!
            5.16.0-rc6-syzkaller #0 Not tainted
            -------------------------------------
            syz-executor011/3597 is trying to release lock (&call->user_mutex) at:
            [<ffffffff885163a3>] rxrpc_do_sendmsg+0xc13/0x1350 net/rxrpc/sendmsg.c:748
            but there are no more locks to release!

            other info that might help us debug this:
            no locks held by syz-executor011/3597.
            ...
            Call Trace:
             <TASK>
             __dump_stack lib/dump_stack.c:88 [inline]
             dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
             print_unlock_imbalance_bug include/trace/events/lock.h:58 [inline]
             __lock_release kernel/locking/lockdep.c:5306 [inline]
             lock_release.cold+0x49/0x4e kernel/locking/lockdep.c:5657
             __mutex_unlock_slowpath+0x99/0x5e0 kernel/locking/mutex.c:900
             rxrpc_do_sendmsg+0xc13/0x1350 net/rxrpc/sendmsg.c:748
             rxrpc_sendmsg+0x420/0x630 net/rxrpc/af_rxrpc.c:561
             sock_sendmsg_nosec net/socket.c:704 [inline]
             sock_sendmsg+0xcf/0x120 net/socket.c:724
             ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
             ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
             __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
             do_syscall_x64 arch/x86/entry/common.c:50 [inline]
             do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
             entry_SYSCALL_64_after_hwframe+0x44/0xae

    [Thanks to Hawkins Jiawei and Khalid Masum for their attempts to fix this]

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-2025-992846
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3dfd4bf4");
  # https://lore.kernel.org/linux-cve-announce/2025061827-CVE-2022-49998-d4dd@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?76d41ddc");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49998");
  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-2022-49998");

  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:"2022/10/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/31");

  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) 2025 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:"^20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060a / 20.1070a', '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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', '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');
}