Unity Linux 20.1070a Security Update: kernel (UTSA-2026-014303)

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

include('compat.inc');

if (description)
{
  script_id(310015);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/23");

  script_cve_id("CVE-2025-71065");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-014303)");

  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-2026-014303 advisory.

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

    f2fs: fix to avoid potential deadlock

    As Jiaming Zhang and syzbot reported, there is potential deadlock in
    f2fs as below:

    Chain exists of:
      &sbi->cp_rwsem --> fs_reclaim --> sb_internal#2

     Possible unsafe locking scenario:

           CPU0                    CPU1
           ----                    ----
      rlock(sb_internal#2);
                                   lock(fs_reclaim);
                                   lock(sb_internal#2);
      rlock(&sbi->cp_rwsem);

     *** DEADLOCK ***

    3 locks held by kswapd0/73:
     #0: ffffffff8e247a40 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:7015 [inline]
     #0: ffffffff8e247a40 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x951/0x2800 mm/vmscan.c:7389
     #1: ffff8880118400e0 (&type->s_umount_key#50){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:562
    [inline]
     #1: ffff8880118400e0 (&type->s_umount_key#50){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197
     #2: ffff888011840610 (sb_internal#2){.+.+}-{0:0}, at: f2fs_evict_inode+0x8d9/0x1b60 fs/f2fs/inode.c:890

    stack backtrace:
    CPU: 0 UID: 0 PID: 73 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full)
    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
    Call Trace:
     <TASK>
     dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
     print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043
     check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175
     check_prev_add kernel/locking/lockdep.c:3165 [inline]
     check_prevs_add kernel/locking/lockdep.c:3284 [inline]
     validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908
     __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
     lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
     down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537
     f2fs_down_read fs/f2fs/f2fs.h:2278 [inline]
     f2fs_lock_op fs/f2fs/f2fs.h:2357 [inline]
     f2fs_do_truncate_blocks+0x21c/0x10c0 fs/f2fs/file.c:791
     f2fs_truncate_blocks+0x10a/0x300 fs/f2fs/file.c:867
     f2fs_truncate+0x489/0x7c0 fs/f2fs/file.c:925
     f2fs_evict_inode+0x9f2/0x1b60 fs/f2fs/inode.c:897
     evict+0x504/0x9c0 fs/inode.c:810
     f2fs_evict_inode+0x1dc/0x1b60 fs/f2fs/inode.c:853
     evict+0x504/0x9c0 fs/inode.c:810
     dispose_list fs/inode.c:852 [inline]
     prune_icache_sb+0x21b/0x2c0 fs/inode.c:1000
     super_cache_scan+0x39b/0x4b0 fs/super.c:224
     do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437
     shrink_slab_memcg mm/shrinker.c:550 [inline]
     shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628
     shrink_one+0x28a/0x7c0 mm/vmscan.c:4955
     shrink_many mm/vmscan.c:5016 [inline]
     lru_gen_shrink_node mm/vmscan.c:5094 [inline]
     shrink_node+0x315d/0x3780 mm/vmscan.c:6081
     kswapd_shrink_node mm/vmscan.c:6941 [inline]
     balance_pgdat mm/vmscan.c:7124 [inline]
     kswapd+0x147c/0x2800 mm/vmscan.c:7389
     kthread+0x70e/0x8a0 kernel/kthread.c:463
     ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
     ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
     </TASK>

    The root cause is deadlock among four locks as below:

    kswapd
    - fs_reclaim                            --- Lock A
     - shrink_one
      - evict
       - f2fs_evict_inode
        - sb_start_intwrite                 --- Lock B

    - iput
     - evict
      - f2fs_evict_inode
       - sb_start_intwrite                  --- Lock B
       - f2fs_truncate
        - f2fs_truncate_blocks
         - f2fs_do_truncate_blocks
          - f2fs_lock_op                    --- Lock C

    ioctl
    - f2fs_ioc_commit_atomic_write
     - f2fs_lock_op                         --- Lock C
      - __f2fs_commit_atomic_write
       - __replace_atomic_write_block
        - f2fs_get_dnode_of_data
         - __get_node_folio
          - f2fs_check_nid_range
           - f2fs_handle_error
            - f2fs_record_errors
             - f2fs_down_write              --- Lock D

    open
    - do_open
     - do_truncate
      - security_inode_need_killpriv
       - f2fs_getxattr
        - lookup_all_xattrs
         - f2fs_handle_error
          - f2fs_record_errors
           - f2fs_down_write                --- Lock D
            - f2fs_commit_super
             - read_mapping_folio
              - filemap_alloc_folio_noprof
               - prepare_alloc_pages
                - fs_reclaim_acquire        --- Lock A

    In order to a
    ---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-2026-014303
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?45d2c742");
  # https://lore.kernel.org/linux-cve-announce/2026011322-CVE-2025-71065-6818@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0af66ce6");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-71065");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/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-2025-71065");

  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:"2026/01/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/23");

  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:"^20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-10', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-10', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-10', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-10', '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');
}