Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2026-50374)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2026-50374.
##

include('compat.inc');

if (description)
{
  script_id(325254);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/06");

  script_cve_id(
    "CVE-2022-50073",
    "CVE-2025-10263",
    "CVE-2026-31504",
    "CVE-2026-31657",
    "CVE-2026-43037",
    "CVE-2026-46331",
    "CVE-2026-52943",
    "CVE-2026-53359"
  );

  script_name(english:"Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2026-50374)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in
the ELSA-2026-50374 advisory.

    - net/sched: fix pedit partial COW leading to page cache corruption (Rajat Gupta)  [Orabug: 39680880]
    {CVE-2026-46331}
    - net: skbuff: fix missing zerocopy reference in pskb_carve helpers (Minh Nguyen)  [Orabug: 39619389]
    {CVE-2026-52943}
    - net: fix fanout UAF in packet_release() via NETDEV_UP race (Yochai Eisenrich)  [Orabug: 39250953]
    {CVE-2026-31504}
    - net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null (Cezar Bulinaru)
    [Orabug: 39526882]  {CVE-2022-50073}
    - arm64: errata: Mitigate TLBI errata on various Arm CPUs (Mark Rutland)  [Orabug: 39548666]
    {CVE-2025-10263}
    - ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (Eric Dumazet)  [Orabug: 39300926]  {CVE-2026-43037}
    - batman-adv: hold claim backbone gateways by reference (Haoze Xie)  [Orabug: 39262375]  {CVE-2026-31657}
    - smb: client: reject userspace cifs.spnego descriptions (Asim Viladi Oglu Manizada)  [Orabug: 39463669]
    {CVE-2026-46243}
    - ptrace: slightly saner 'get_dumpable()' logic (Linus Torvalds) [Orabug: 39384275,39391459]
    {CVE-2026-46333}
    - net: skbuff: propagate shared-frag marker through frag-transfer helpers (Hyunwoo Kim) [Orabug:
    39368828,39441326] {CVE-2026-43503,CVE-2026-46300}
    - net: skbuff: preserve shared-frag marker during coalescing (William Bowling) [Orabug: 39368828]
    {CVE-2026-46300}
    - nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (Jeff Layton) [Orabug: 39167617,39368718]
    {CVE-2026-31402}
    - scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() (Maurizio Lombardi) [Orabug:
    38985173,39368732] {CVE-2026-23216}
    - scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() (Maurizio Lombardi) [Orabug:
    38970455,39368774] {CVE-2026-23193}
    - xfrm: esp: avoid in-place decrypt on shared skb frags (Kuan-Ting Chen) [Orabug: 39334580,39367147]
    {CVE-2026-43284}
    - x86/CPU/AMD: Add a fix for AMD-SB-7052 (Prathyushi Nangia) [Orabug: 39218897] {CVE-2025-54518}
    - crypto: algif_aead - Fix minimum RX size check for decryption (Herbert Xu) [Orabug: 39250687,39331106]
    {CVE-2026-43077}
    - crypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl (Herbert Xu) [Orabug:
    39250687,39331111] {CVE-2026-43078}
    - crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption (Herbert Xu) [Orabug:
    39250687,39300911] {CVE-2026-43033}
    - crypto: algif_aead - snapshot IV for async AEAD requests (Douya Le) [Orabug: 39250687,39452217]
    {CVE-2026-46028}
    - crypto: algif_aead - Revert to operating out-of-place (Herbert Xu) [Orabug: 39250687,39283868,39292250]
    {CVE-2026-31431}
    - crypto: algif_aead - use memcpy_sglist() instead of null skcipher (Eric Biggers) [Orabug: 39250687]
    {CVE-2026-31431}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/ELSA-2026-50374.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-50073");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/11/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:8:10:baseos_patch");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-container");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-container-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-tools");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Oracle 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("linux_alt_patch_detect.nasl", "ssh_get_info.nasl");
  script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


include('rpm2.inc');
include('ksplice.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) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_product)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
if (! preg(pattern:"^(7|8)([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'Oracle Linux 7.x / 8.x', 'Oracle Linux ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);

var machine_uptrack_level = get_one_kb_item('Host/livepatch-kernel-version');
var livepatch_source = get_one_kb_item('Host/livepatch-kernel-source');
if (empty_or_null(livepatch_source)) livepatch_source = 'KSplice';

if (machine_uptrack_level)
{
  var trimmed_uptrack_level = ereg_replace(string:machine_uptrack_level, pattern:"\.(x86_64|i[3-6]86|aarch64)$", replace:'');
  var fixed_uptrack_levels = ['5.4.17-2136.357.3.1.el7uek', '5.4.17-2136.357.3.1.el8uek'];
  foreach var fixed_uptrack_level ( fixed_uptrack_levels ) {
    if (rpm_spec_vers_cmp(a:trimmed_uptrack_level, b:fixed_uptrack_level) >= 0)
    {
      audit(AUDIT_PATCH_INSTALLED, livepatch_source + ' hotfix for ELSA-2026-50374');
    }
  }
  __rpm_report = 'Running ' + livepatch_source + ' level of ' + trimmed_uptrack_level + ' does not meet the minimum fixed level of ' + join(fixed_uptrack_levels, sep:' / ') + ' for this advisory.\n\n';
}

var kernel_major_minor = get_kb_item('Host/uname/major_minor');
if (empty_or_null(kernel_major_minor)) exit(1, 'Unable to determine kernel major-minor level.');
var expected_kernel_major_minor = '5.4';
if (kernel_major_minor != expected_kernel_major_minor)
  audit(AUDIT_OS_NOT, 'running kernel level ' + expected_kernel_major_minor + ', it is running kernel level ' + kernel_major_minor);

var constraints = [
  {
    'release': '7',
    'pkgs': [
      {'reference':'kernel-uek-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-5.4.17'},
      {'reference':'kernel-uek-container-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-container-5.4.17'},
      {'reference':'kernel-uek-container-debug-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-container-debug-5.4.17'},
      {'reference':'kernel-uek-debug-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-5.4.17'},
      {'reference':'kernel-uek-debug-devel-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-devel-5.4.17'},
      {'reference':'kernel-uek-devel-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-devel-5.4.17'},
      {'reference':'kernel-uek-doc-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-doc-5.4.17'},
      {'reference':'kernel-uek-tools-5.4.17-2136.357.3.1.el7uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-tools-5.4.17'}
    ]
  },
  {
    'release': '8',
    'pkgs': [
      {'reference':'kernel-uek-5.4.17-2136.357.3.1.el8uek', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-5.4.17'},
      {'reference':'kernel-uek-debug-5.4.17-2136.357.3.1.el8uek', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-5.4.17'},
      {'reference':'kernel-uek-debug-devel-5.4.17-2136.357.3.1.el8uek', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-devel-5.4.17'},
      {'reference':'kernel-uek-devel-5.4.17-2136.357.3.1.el8uek', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-devel-5.4.17'},
      {'reference':'kernel-uek-doc-5.4.17-2136.357.3.1.el8uek', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-doc-5.4.17'},
      {'reference':'kernel-uek-5.4.17-2136.357.3.1.el8uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-5.4.17'},
      {'reference':'kernel-uek-container-5.4.17-2136.357.3.1.el8uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-container-5.4.17'},
      {'reference':'kernel-uek-container-debug-5.4.17-2136.357.3.1.el8uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-container-debug-5.4.17'},
      {'reference':'kernel-uek-debug-5.4.17-2136.357.3.1.el8uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-5.4.17'},
      {'reference':'kernel-uek-debug-devel-5.4.17-2136.357.3.1.el8uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-devel-5.4.17'},
      {'reference':'kernel-uek-devel-5.4.17-2136.357.3.1.el8uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-devel-5.4.17'},
      {'reference':'kernel-uek-doc-5.4.17-2136.357.3.1.el8uek', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-doc-5.4.17'}
    ]
  }
];

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-uek / kernel-uek-container / kernel-uek-container-debug / etc');
}