Unity Linux 20.1050a Security Update: kernel (UTSA-2026-053430)

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

include('compat.inc');

if (description)
{
  script_id(343236);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/06");

  script_cve_id("CVE-2022-48744");

  script_name(english:"Unity Linux 20.1050a Security Update: kernel (UTSA-2026-053430)");

  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-2026-053430 advisory.

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

    net/mlx5e: Avoid field-overflowing memcpy()

    In preparation for FORTIFY_SOURCE performing compile-time and run-time
    field bounds checking for memcpy(), memmove(), and memset(), avoid
    intentionally writing across neighboring fields.

    Use flexible arrays instead of zero-element arrays (which look like they
    are always overflowing) and split the cross-field memcpy() into two halves
    that can be appropriately bounds-checked by the compiler.

    We were doing:

            #define ETH_HLEN  14
            #define VLAN_HLEN  4
            ...
            #define MLX5E_XDP_MIN_INLINE (ETH_HLEN + VLAN_HLEN)
            ...
            struct mlx5e_tx_wqe      *wqe  = mlx5_wq_cyc_get_wqe(wq, pi);
            ...
            struct mlx5_wqe_eth_seg  *eseg = &wqe->eth;
            struct mlx5_wqe_data_seg *dseg = wqe->data;
            ...
            memcpy(eseg->inline_hdr.start, xdptxd->data, MLX5E_XDP_MIN_INLINE);

    target is wqe->eth.inline_hdr.start (which the compiler sees as being
    2 bytes in size), but copying 18, intending to write across start
    (really vlan_tci, 2 bytes). The remaining 16 bytes get written into
    wqe->data[0], covering byte_count (4 bytes), lkey (4 bytes), and addr
    (8 bytes).

    struct mlx5e_tx_wqe {
            struct mlx5_wqe_ctrl_seg   ctrl;                 /*     0    16 */
            struct mlx5_wqe_eth_seg    eth;                  /*    16    16 */
            struct mlx5_wqe_data_seg   data[];               /*    32     0 */

            /* size: 32, cachelines: 1, members: 3 */
            /* last cacheline: 32 bytes */
    };

    struct mlx5_wqe_eth_seg {
            u8                         swp_outer_l4_offset;  /*     0     1 */
            u8                         swp_outer_l3_offset;  /*     1     1 */
            u8                         swp_inner_l4_offset;  /*     2     1 */
            u8                         swp_inner_l3_offset;  /*     3     1 */
            u8                         cs_flags;             /*     4     1 */
            u8                         swp_flags;            /*     5     1 */
            __be16                     mss;                  /*     6     2 */
            __be32                     flow_table_metadata;  /*     8     4 */
            union {
                    struct {
                            __be16     sz;                   /*    12     2 */
                            u8         start[2];             /*    14     2 */
                    } inline_hdr;                            /*    12     4 */
                    struct {
                            __be16     type;                 /*    12     2 */
                            __be16     vlan_tci;             /*    14     2 */
                    } insert;                                /*    12     4 */
                    __be32             trailer;              /*    12     4 */
            };                                               /*    12     4 */

            /* size: 16, cachelines: 1, members: 9 */
            /* last cacheline: 16 bytes */
    };

    struct mlx5_wqe_data_seg {
            __be32                     byte_count;           /*     0     4 */
            __be32                     lkey;                 /*     4     4 */
            __be64                     addr;                 /*     8     8 */

            /* size: 16, cachelines: 1, members: 3 */
            /* last cacheline: 16 bytes */
    };

    So, split the memcpy() so the compiler can reason about the buffer
    sizes.

    pahole shows no size nor member offset changes to struct mlx5e_tx_wqe
    nor struct mlx5e_umr_wqe. objdump -d shows no meaningful object
    code changes (i.e. only source line number induced differences and
    optimizations).

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-2026-053430
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2b850f3f");
  # https://lore.kernel.org/linux-cve-announce/2024062003-CVE-2022-48744-0f03@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2a8cb0b9");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-48744");
  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-2022-48744");

  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:"2024/06/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/06");

  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');
}