Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099899)

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

include('compat.inc');

if (description)
{
  script_id(336861);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/17");

  script_cve_id("CVE-2026-43277");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099899)");

  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-2026-099899 advisory.

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

    APEI/GHES: ensure that won't go past CPER allocated record

    The logic at ghes_new() prevents allocating too large records, by
    checking if they're bigger than GHES_ESTATUS_MAX_SIZE (currently, 64KB).
    Yet, the allocation is done with the actual number of pages from the
    CPER bios table location, which can be smaller.

    Yet, a bad firmware could send data with a different size, which might
    be bigger than the allocated memory, causing an OOPS:

        Unable to handle kernel paging request at virtual address fff00000f9b40000
        Mem abort info:
          ESR = 0x0000000096000007
          EC = 0x25: DABT (current EL), IL = 32 bits
          SET = 0, FnV = 0
          EA = 0, S1PTW = 0
          FSC = 0x07: level 3 translation fault
        Data abort info:
          ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000
          CM = 0, WnR = 0, TnD = 0, TagAccess = 0
          GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
        swapper pgtable: 4k pages, 52-bit VAs, pgdp=000000008ba16000
        [fff00000f9b40000] pgd=180000013ffff403, p4d=180000013fffe403, pud=180000013f85b403,
    pmd=180000013f68d403, pte=0000000000000000
        Internal error: Oops: 0000000096000007 [#1]  SMP
        Modules linked in:
        CPU: 0 UID: 0 PID: 303 Comm: kworker/0:1 Not tainted 6.19.0-rc1-00002-gda407d200220 #34 PREEMPT
        Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022
        Workqueue: kacpi_notify acpi_os_execute_deferred
        pstate: 214020c5 (nzCv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
        pc : hex_dump_to_buffer+0x30c/0x4a0
        lr : hex_dump_to_buffer+0x328/0x4a0
        sp : ffff800080e13880
        x29: ffff800080e13880 x28: ffffac9aba86f6a8 x27: 0000000000000083
        x26: fff00000f9b3fffc x25: 0000000000000004 x24: 0000000000000004
        x23: ffff800080e13905 x22: 0000000000000010 x21: 0000000000000083
        x20: 0000000000000001 x19: 0000000000000008 x18: 0000000000000010
        x17: 0000000000000001 x16: 00000007c7f20fec x15: 0000000000000020
        x14: 0000000000000008 x13: 0000000000081020 x12: 0000000000000008
        x11: ffff800080e13905 x10: ffff800080e13988 x9 : 0000000000000000
        x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000020
        x5 : 0000000000000030 x4 : 00000000fffffffe x3 : 0000000000000000
        x2 : ffffac9aba78c1c8 x1 : ffffac9aba76d0a8 x0 : 0000000000000008
        Call trace:
         hex_dump_to_buffer+0x30c/0x4a0 (P)
         print_hex_dump+0xac/0x170
         cper_estatus_print_section+0x90c/0x968
         cper_estatus_print+0xf0/0x158
         __ghes_print_estatus+0xa0/0x148
         ghes_proc+0x1bc/0x220
         ghes_notify_hed+0x5c/0xb8
         notifier_call_chain+0x78/0x148
         blocking_notifier_call_chain+0x4c/0x80
         acpi_hed_notify+0x28/0x40
         acpi_ev_notify_dispatch+0x50/0x80
         acpi_os_execute_deferred+0x24/0x48
         process_one_work+0x15c/0x3b0
         worker_thread+0x2d0/0x400
         kthread+0x148/0x228
         ret_from_fork+0x10/0x20
        Code: 6b14033f 540001ad a94707e2 f100029f (b8747b44)
        ---[ end trace 0000000000000000 ]---

    Prevent that by taking the actual allocated are into account when
    checking for CPER length.

    [ rjw: Subject tweaks ]

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-2026-099899
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8de0dcd7");
  # https://lore.kernel.org/linux-cve-announce/2026050612-CVE-2026-43277-7db8@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7e97d53c");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2026-43277");
  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-2026-43277");

  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:"2026/04/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/17");

  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([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e', '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-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', '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');
}