Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098734)

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

include('compat.inc');

if (description)
{
  script_id(340420);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/26");

  script_cve_id("CVE-2025-40064");

  script_name(english:"Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098734)");

  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-2026-098734 advisory.

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

    smc: Fix use-after-free in __pnet_find_base_ndev().

    syzbot reported use-after-free of net_device in __pnet_find_base_ndev(),
    which was called during connect(). [0]

    smc_pnet_find_ism_resource() fetches sk_dst_get(sk)->dev and passes
    down to pnet_find_base_ndev(), where RTNL is held.  Then, UAF happened
    at __pnet_find_base_ndev() when the dev is first used.

    This means dev had already been freed before acquiring RTNL in
    pnet_find_base_ndev().

    While dev is going away, dst->dev could be swapped with blackhole_netdev,
    and the dev's refcnt by dst will be released.

    We must hold dev's refcnt before calling smc_pnet_find_ism_resource().

    Also, smc_pnet_find_roce_resource() has the same problem.

    Let's use __sk_dst_get() and dst_dev_rcu() in the two functions.

    [0]:
    BUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926
    Read of size 1 at addr ffff888036bac33a by task syz.0.3632/18609

    CPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full)
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
    Call Trace:
     <TASK>
     dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
     print_address_description mm/kasan/report.c:378 [inline]
     print_report+0xca/0x240 mm/kasan/report.c:482
     kasan_report+0x118/0x150 mm/kasan/report.c:595
     __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926
     pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline]
     smc_pnet_find_ism_by_pnetid net/smc/smc_pnet.c:1103 [inline]
     smc_pnet_find_ism_resource+0xef/0x390 net/smc/smc_pnet.c:1154
     smc_find_ism_device net/smc/af_smc.c:1030 [inline]
     smc_find_proposal_devices net/smc/af_smc.c:1115 [inline]
     __smc_connect+0x372/0x1890 net/smc/af_smc.c:1545
     smc_connect+0x877/0xd90 net/smc/af_smc.c:1715
     __sys_connect_file net/socket.c:2086 [inline]
     __sys_connect+0x313/0x440 net/socket.c:2105
     __do_sys_connect net/socket.c:2111 [inline]
     __se_sys_connect net/socket.c:2108 [inline]
     __x64_sys_connect+0x7a/0x90 net/socket.c:2108
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    RIP: 0033:0x7f47cbf8eba9
    Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007f47ccdb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
    RAX: ffffffffffffffda RBX: 00007f47cc1d5fa0 RCX: 00007f47cbf8eba9
    RDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000b
    RBP: 00007f47cc011e19 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
    R13: 00007f47cc1d6038 R14: 00007f47cc1d5fa0 R15: 00007ffc512f8aa8
     </TASK>

    The buggy address belongs to the physical page:
    page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888036bacd00 pfn:0x36bac
    flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
    raw: 00fff00000000000 ffffea0001243d08 ffff8880b863fdc0 0000000000000000
    raw: ffff888036bacd00 0000000000000000 00000000ffffffff 0000000000000000
    page dumped because: kasan: bad access detected
    page_owner tracks the page as freed
    page last allocated via order 2, migratetype Unmovable, gfp_mask
    0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 16741, tgid 16741
    (syz-executor), ts 343313197788, free_ts 380670750466
     set_page_owner include/linux/page_owner.h:32 [inline]
     post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
     prep_new_page mm/page_alloc.c:1859 [inline]
     get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
     __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
     alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
     ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4317
     __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4348
     __do_kmalloc_node mm/slub.c:4364 [inline]
     __kvmalloc_node
    ---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-2026-098734
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?825cc421");
  # https://lore.kernel.org/linux-cve-announce/2025102817-CVE-2025-40064-0c16@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ed1492a0");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-40064");
  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-2025-40064");

  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:"2025/10/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/26");

  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:"^20.1050a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050a', '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': '1050a',
    'pkgs': [
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.132.24.uelc20', 'sp':'1050a', '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');
}