Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-107313)

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

include('compat.inc');

if (description)
{
  script_id(344936);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/11");

  script_cve_id("CVE-2022-49898");

  script_name(english:"Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-107313)");

  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-2026-107313 advisory.

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

    btrfs: fix tree mod log mishandling of reallocated nodes

    We have been seeing the following panic in production

      kernel BUG at fs/btrfs/tree-mod-log.c:677!
      invalid opcode: 0000 [#1] SMP
      RIP: 0010:tree_mod_log_rewind+0x1b4/0x200
      RSP: 0000:ffffc9002c02f890 EFLAGS: 00010293
      RAX: 0000000000000003 RBX: ffff8882b448c700 RCX: 0000000000000000
      RDX: 0000000000008000 RSI: 00000000000000a7 RDI: ffff88877d831c00
      RBP: 0000000000000002 R08: 000000000000009f R09: 0000000000000000
      R10: 0000000000000000 R11: 0000000000100c40 R12: 0000000000000001
      R13: ffff8886c26d6a00 R14: ffff88829f5424f8 R15: ffff88877d831a00
      FS:  00007fee1d80c780(0000) GS:ffff8890400c0000(0000) knlGS:0000000000000000
      CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      CR2: 00007fee1963a020 CR3: 0000000434f33002 CR4: 00000000007706e0
      DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      PKRU: 55555554
      Call Trace:
       btrfs_get_old_root+0x12b/0x420
       btrfs_search_old_slot+0x64/0x2f0
       ? tree_mod_log_oldest_root+0x3d/0xf0
       resolve_indirect_ref+0xfd/0x660
       ? ulist_alloc+0x31/0x60
       ? kmem_cache_alloc_trace+0x114/0x2c0
       find_parent_nodes+0x97a/0x17e0
       ? ulist_alloc+0x30/0x60
       btrfs_find_all_roots_safe+0x97/0x150
       iterate_extent_inodes+0x154/0x370
       ? btrfs_search_path_in_tree+0x240/0x240
       iterate_inodes_from_logical+0x98/0xd0
       ? btrfs_search_path_in_tree+0x240/0x240
       btrfs_ioctl_logical_to_ino+0xd9/0x180
       btrfs_ioctl+0xe2/0x2ec0
       ? __mod_memcg_lruvec_state+0x3d/0x280
       ? do_sys_openat2+0x6d/0x140
       ? kretprobe_dispatcher+0x47/0x70
       ? kretprobe_rethook_handler+0x38/0x50
       ? rethook_trampoline_handler+0x82/0x140
       ? arch_rethook_trampoline_callback+0x3b/0x50
       ? kmem_cache_free+0xfb/0x270
       ? do_sys_openat2+0xd5/0x140
       __x64_sys_ioctl+0x71/0xb0
       do_syscall_64+0x2d/0x40

    Which is this code in tree_mod_log_rewind()

            switch (tm->op) {
            case BTRFS_MOD_LOG_KEY_REMOVE_WHILE_FREEING:
                    BUG_ON(tm->slot < n);

    This occurs because we replay the nodes in order that they happened, and
    when we do a REPLACE we will log a REMOVE_WHILE_FREEING for every slot,
    starting at 0.  'n' here is the number of items in this block, which in
    this case was 1, but we had 2 REMOVE_WHILE_FREEING operations.

    The actual root cause of this was that we were replaying operations for
    a block that shouldn't have been replayed.  Consider the following
    sequence of events

    1. We have an already modified root, and we do a btrfs_get_tree_mod_seq().
    2. We begin removing items from this root, triggering KEY_REPLACE for
       it's child slots.
    3. We remove one of the 2 children this root node points to, thus triggering
       the root node promotion of the remaining child, and freeing this node.
    4. We modify a new root, and re-allocate the above node to the root node of
       this other root.

    The tree mod log looks something like this

            logical 0       op KEY_REPLACE (slot 1)                 seq 2
            logical 0       op KEY_REMOVE (slot 1)                  seq 3
            logical 0       op KEY_REMOVE_WHILE_FREEING (slot 0)    seq 4
            logical 4096    op LOG_ROOT_REPLACE (old logical 0)     seq 5
            logical 8192    op KEY_REMOVE_WHILE_FREEING (slot 1)    seq 6
            logical 8192    op KEY_REMOVE_WHILE_FREEING (slot 0)    seq 7
            logical 0       op LOG_ROOT_REPLACE (old logical 8192)  seq 8

    >From here the bug is triggered by the following steps

    1.  Call btrfs_get_old_root() on the new_root.
    2.  We call tree_mod_log_oldest_root(btrfs_root_node(new_root)), which is
        currently logical 0.
    3.  tree_mod_log_oldest_root() calls tree_mod_log_search_oldest(), which
        gives us the KEY_REPLACE seq 2, and since that's not a
        LOG_ROOT_REPLACE we incorrectly believe that we don't have an old
        root, because we expect that the most recent change should be a
        LOG_ROOT_REPLACE.
    4.  Back in tree_mod_log_oldest_root() we don't have a LOG_ROOT_REPLACE,
        so we don't set old_root, we simply use our e
    ---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-2026-107313
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3e99887b");
  script_set_attribute(attribute:"see_also", value:"https://atomgit.com/src-openeuler/kernel/issues/10470");
  # https://lore.kernel.org/linux-cve-announce/2025050100-CVE-2022-49898-e08b@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d0152523");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49898");
  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-2022-49898");

  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:"2022/12/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/11");

  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|20.1060e|20.1070e)([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e / 20.1060e / 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': '1050e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2305.1.0.0199.122.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.122.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2305.1.0.0199.122.uel20', 'sp':'1050e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1060e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2311.4.0.0227.122.uel20', 'sp':'1060e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2311.4.0.0227.122.uel20', 'sp':'1060e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2311.4.0.0227.122.uel20', 'sp':'1060e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2601.1.0.0023.uel20', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2601.1.0.0023.uel20', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2601.1.0.0023.uel20', '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');
}