Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986906)

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

include('compat.inc');

if (description)
{
  script_id(268130);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2022-48956");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986906)");

  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-2025-986906 advisory.

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

    ipv6: avoid use-after-free in ip6_fragment()

    Blamed commit claimed rcu_read_lock() was held by ip6_fragment() callers.

    It seems to not be always true, at least for UDP stack.

    syzbot reported:

    BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:245 [inline]
    BUG: KASAN: use-after-free in ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951
    Read of size 8 at addr ffff88801d403e80 by task syz-executor.3/7618

    CPU: 1 PID: 7618 Comm: syz-executor.3 Not tainted 6.1.0-rc6-syzkaller-00012-g4312098baf37 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
    Call Trace:
     <TASK>
     __dump_stack lib/dump_stack.c:88 [inline]
     dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
     print_address_description mm/kasan/report.c:284 [inline]
     print_report+0x15e/0x45d mm/kasan/report.c:395
     kasan_report+0xbf/0x1f0 mm/kasan/report.c:495
     ip6_dst_idev include/net/ip6_fib.h:245 [inline]
     ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951
     __ip6_finish_output net/ipv6/ip6_output.c:193 [inline]
     ip6_finish_output+0x9a3/0x1170 net/ipv6/ip6_output.c:206
     NF_HOOK_COND include/linux/netfilter.h:291 [inline]
     ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
     dst_output include/net/dst.h:445 [inline]
     ip6_local_out+0xb3/0x1a0 net/ipv6/output_core.c:161
     ip6_send_skb+0xbb/0x340 net/ipv6/ip6_output.c:1966
     udp_v6_send_skb+0x82a/0x18a0 net/ipv6/udp.c:1286
     udp_v6_push_pending_frames+0x140/0x200 net/ipv6/udp.c:1313
     udpv6_sendmsg+0x18da/0x2c80 net/ipv6/udp.c:1606
     inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:665
     sock_sendmsg_nosec net/socket.c:714 [inline]
     sock_sendmsg+0xd3/0x120 net/socket.c:734
     sock_write_iter+0x295/0x3d0 net/socket.c:1108
     call_write_iter include/linux/fs.h:2191 [inline]
     new_sync_write fs/read_write.c:491 [inline]
     vfs_write+0x9ed/0xdd0 fs/read_write.c:584
     ksys_write+0x1ec/0x250 fs/read_write.c:637
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x63/0xcd
    RIP: 0033:0x7fde3588c0d9
    Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007fde365b6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
    RAX: ffffffffffffffda RBX: 00007fde359ac050 RCX: 00007fde3588c0d9
    RDX: 000000000000ffdc RSI: 00000000200000c0 RDI: 000000000000000a
    RBP: 00007fde358e7ae9 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
    R13: 00007fde35acfb1f R14: 00007fde365b6300 R15: 0000000000022000
     </TASK>

    Allocated by task 7618:
     kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
     kasan_set_track+0x25/0x30 mm/kasan/common.c:52
     __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:325
     kasan_slab_alloc include/linux/kasan.h:201 [inline]
     slab_post_alloc_hook mm/slab.h:737 [inline]
     slab_alloc_node mm/slub.c:3398 [inline]
     slab_alloc mm/slub.c:3406 [inline]
     __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
     kmem_cache_alloc+0x2b4/0x3d0 mm/slub.c:3422
     dst_alloc+0x14a/0x1f0 net/core/dst.c:92
     ip6_dst_alloc+0x32/0xa0 net/ipv6/route.c:344
     ip6_rt_pcpu_alloc net/ipv6/route.c:1369 [inline]
     rt6_make_pcpu_route net/ipv6/route.c:1417 [inline]
     ip6_pol_route+0x901/0x1190 net/ipv6/route.c:2254
     pol_lookup_func include/net/ip6_fib.h:582 [inline]
     fib6_rule_lookup+0x52e/0x6f0 net/ipv6/fib6_rules.c:121
     ip6_route_output_flags_noref+0x2e6/0x380 net/ipv6/route.c:2625
     ip6_route_output_flags+0x76/0x320 net/ipv6/route.c:2638
     ip6_route_output include/net/ip6_route.h:98 [inline]
     ip6_dst_lookup_tail+0x5ab/0x1620 net/ipv6/ip6_output.c:1092
     ip6_dst_lookup_flow+0x90/0x1d0 net/ipv6/ip6_output.c:1222
     ip6_sk_dst_lookup_flow+0x553/0x980 net/ipv6/ip6_output.c:1260
     udpv6_sendmsg+0x151d/0x2c80 net/ipv6/udp.c:1554
     inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:665
     sock_sendmsg_nosec n
    ---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-2025-986906
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?245265d8");
  # https://lore.kernel.org/linux-cve-announce/2024102142-CVE-2022-48956-75c8@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?715b4243");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-48956");
  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-2022-48956");

  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:"2023/01/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/07");

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


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-74.16', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', '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');
}