RHEL 10 : kpatch-patch-6_12_0-211_16_1 (RHSA-2026:43826)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:43826. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(329082);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/22");

  script_cve_id("CVE-2026-46242", "CVE-2026-53359", "CVE-2026-53362");
  script_xref(name:"RHSA", value:"2026:43826");

  script_name(english:"RHEL 10 : kpatch-patch-6_12_0-211_16_1 (RHSA-2026:43826)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for kpatch-patch-6_12_0-211_16_1.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as
referenced in the RHSA-2026:43826 advisory.

    This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the
    code of a running kernel.  This patch module is targeted for kernel-6.12.0-211.16.1.el10_2.

    Security Fix(es):

    * kernel: eventpoll: fix ep_remove struct eventpoll / struct file UAF (CVE-2026-46242)

    * kernel: kernel: ipv6 frag escape (CVE-2026-53362)

    * kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2483519");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2495904");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2497033");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_43826.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?56bd5a05");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:43826");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL kpatch-patch-6_12_0-211_16_1 package based on the guidance in RHSA-2026:43826.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:S/C:C/I:C/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:C/C:H/I:H/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-2026-53362");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-53359");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(130, 825);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10.2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-6_12_0-211_16_1");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat 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_info.nasl", "redhat_repos.nasl", "linux_alt_patch_detect.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.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) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release(operator: 'ge', os_version: os_version, rhel_version: '10')) audit(AUDIT_OS_NOT, 'Red Hat 10.x', 'Red Hat ' + 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$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var uname_r = get_kb_item("Host/uname-r");
if (empty_or_null(uname_r)) audit(AUDIT_UNKNOWN_APP_VER, "kernel");
if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var livepatch_source = get_one_kb_item('Host/livepatch-kernel-source');
  if (empty_or_null(livepatch_source)) livepatch_source = 'KSplice';
  rm_kb_item(name:'Host/livepatch-kernel-version');

  var cve_list = make_list('CVE-2026-46242', 'CVE-2026-53359', 'CVE-2026-53362');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, livepatch_source + ' hotfix for RHSA-2026:43826');
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

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      'content/dist/rhel10/10.3/x86_64/sap/source/SRPMS',
      'content/dist/rhel10/10.3/x86_64/supplementary/debug',
      'content/dist/rhel10/10.3/x86_64/supplementary/os',
      'content/dist/rhel10/10.3/x86_64/supplementary/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/appstream/debug',
      'content/dist/rhel10/10/ppc64le/appstream/os',
      'content/dist/rhel10/10/ppc64le/appstream/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/baseos/debug',
      'content/dist/rhel10/10/ppc64le/baseos/os',
      'content/dist/rhel10/10/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/codeready-builder/debug',
      'content/dist/rhel10/10/ppc64le/codeready-builder/os',
      'content/dist/rhel10/10/ppc64le/codeready-builder/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/extensions/debug',
      'content/dist/rhel10/10/ppc64le/extensions/os',
      'content/dist/rhel10/10/ppc64le/extensions/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/highavailability/debug',
      'content/dist/rhel10/10/ppc64le/highavailability/os',
      'content/dist/rhel10/10/ppc64le/highavailability/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/sap-solutions/debug',
      'content/dist/rhel10/10/ppc64le/sap-solutions/os',
      'content/dist/rhel10/10/ppc64le/sap-solutions/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/sap/debug',
      'content/dist/rhel10/10/ppc64le/sap/os',
      'content/dist/rhel10/10/ppc64le/sap/source/SRPMS',
      'content/dist/rhel10/10/ppc64le/supplementary/debug',
      'content/dist/rhel10/10/ppc64le/supplementary/os',
      'content/dist/rhel10/10/ppc64le/supplementary/source/SRPMS',
      'content/dist/rhel10/10/x86_64/appstream/debug',
      'content/dist/rhel10/10/x86_64/appstream/os',
      'content/dist/rhel10/10/x86_64/appstream/source/SRPMS',
      'content/dist/rhel10/10/x86_64/baseos/debug',
      'content/dist/rhel10/10/x86_64/baseos/os',
      'content/dist/rhel10/10/x86_64/baseos/source/SRPMS',
      'content/dist/rhel10/10/x86_64/codeready-builder/debug',
      'content/dist/rhel10/10/x86_64/codeready-builder/os',
      'content/dist/rhel10/10/x86_64/codeready-builder/source/SRPMS',
      'content/dist/rhel10/10/x86_64/extensions/debug',
      'content/dist/rhel10/10/x86_64/extensions/os',
      'content/dist/rhel10/10/x86_64/extensions/source/SRPMS',
      'content/dist/rhel10/10/x86_64/highavailability/debug',
      'content/dist/rhel10/10/x86_64/highavailability/os',
      'content/dist/rhel10/10/x86_64/highavailability/source/SRPMS',
      'content/dist/rhel10/10/x86_64/nfv/debug',
      'content/dist/rhel10/10/x86_64/nfv/os',
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      'content/dist/rhel10/10/x86_64/rt/debug',
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      'content/dist/rhel10/10/x86_64/supplementary/os',
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      'content/e6s/rhel10/10.2/ppc64le/appstream/os',
      'content/e6s/rhel10/10.2/ppc64le/appstream/source/SRPMS',
      'content/e6s/rhel10/10.2/ppc64le/baseos/debug',
      'content/e6s/rhel10/10.2/ppc64le/baseos/os',
      'content/e6s/rhel10/10.2/ppc64le/baseos/source/SRPMS',
      'content/e6s/rhel10/10.2/ppc64le/highavailability/debug',
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      'content/e6s/rhel10/10.2/ppc64le/highavailability/source/SRPMS',
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      'content/e6s/rhel10/10.2/x86_64/appstream/source/SRPMS',
      'content/e6s/rhel10/10.2/x86_64/baseos/debug',
      'content/e6s/rhel10/10.2/x86_64/baseos/os',
      'content/e6s/rhel10/10.2/x86_64/baseos/source/SRPMS',
      'content/e6s/rhel10/10.2/x86_64/highavailability/debug',
      'content/e6s/rhel10/10.2/x86_64/highavailability/os',
      'content/e6s/rhel10/10.2/x86_64/highavailability/source/SRPMS',
      'content/e6s/rhel10/10.2/x86_64/nfv/debug',
      'content/e6s/rhel10/10.2/x86_64/nfv/os',
      'content/e6s/rhel10/10.2/x86_64/nfv/source/SRPMS',
      'content/e6s/rhel10/10.2/x86_64/rt/debug',
      'content/e6s/rhel10/10.2/x86_64/rt/os',
      'content/e6s/rhel10/10.2/x86_64/rt/source/SRPMS',
      'content/e6s/rhel10/10.2/x86_64/sap/debug',
      'content/e6s/rhel10/10.2/x86_64/sap/os',
      'content/e6s/rhel10/10.2/x86_64/sap/source/SRPMS'
    ],
    'kernels': {
      '6.12.0-211.16.1.el10_2.ppc64le': {
        'pkgs': [
          {'reference':'kpatch-patch-6_12_0-211_16_1-1-4.el10_2', 'cpu':'ppc64le', 'rpm_spec_vers_cmp':TRUE},
        ]
      },
      '6.12.0-211.16.1.el10_2.x86_64': {
        'pkgs': [
          {'reference':'kpatch-patch-6_12_0-211_16_1-1-4.el10_2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
        ]
      }
    }
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

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 repo_relative_urls;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
var kernel_affected = FALSE;
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;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  var kpatch_details = constraint['kernels'][uname_r];
  if (empty_or_null(kpatch_details)) continue;
  kernel_affected = TRUE;

  foreach var pkg ( kpatch_details['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 &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!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++;
  }
}
# No kpatch details found for the running kernel version
if (!kernel_affected) audit(AUDIT_INST_VER_NOT_VULN, 'kernel', uname_r);


if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kpatch-patch-6_12_0-211_16_1');
}