RHEL 9 : kernel (RHSA-2026:92993)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:92993. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(374291);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/30");

  script_cve_id(
    "CVE-2022-50315",
    "CVE-2025-68745",
    "CVE-2026-43020",
    "CVE-2026-43450",
    "CVE-2026-43493",
    "CVE-2026-46149",
    "CVE-2026-52972",
    "CVE-2026-53224",
    "CVE-2026-53246",
    "CVE-2026-63802",
    "CVE-2026-63831",
    "CVE-2026-63920",
    "CVE-2026-63922",
    "CVE-2026-63924",
    "CVE-2026-63984",
    "CVE-2026-63993",
    "CVE-2026-64017",
    "CVE-2026-64319",
    "CVE-2026-72098",
    "CVE-2026-72243",
    "CVE-2026-74641",
    "CVE-2026-80792",
    "CVE-2026-89846"
  );
  script_xref(name:"RHSA", value:"2026:92993");

  script_name(english:"RHEL 9 : kernel (RHSA-2026:92993)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:92993 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * kernel: ata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX_PORTS (CVE-2022-50315)

    * kernel: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after
    chip reset (CVE-2025-68745)

    * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)

    * kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() (CVE-2026-43450)

    * kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests (CVE-2026-43493)

    * kernel: Linux kernel: xfrm single-frag length not properly limited ()

    * kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() (CVE-2026-46149)

    * kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000 (CVE-2026-52972)

    * kernel: sctp: validate embedded INIT chunk and address list lengths in cookie (CVE-2026-53224)

    * kernel: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing (CVE-2026-53246)

    * kernel: mac802154: llsec: add skb_cow_data() before in-place crypto (CVE-2026-63831)

    * kernel: blk-cgroup: fix UAF in __blkcg_rstat_flush() (CVE-2026-63802)

    * kernel: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() (CVE-2026-63924)

    * kernel: ipv6: exthdrs: refresh nh after handling HAO option (CVE-2026-63922)

    * kernel: ipv6: validate extension header length before copying to cmsg (CVE-2026-63920)

    * kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() (CVE-2026-63993)

    * kernel: ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress() (CVE-2026-63984)

    * kernel: blk-mq: pop cached request if it is usable (CVE-2026-64017)

    * kernel: nvmet-auth: validate reply message payload bounds against transfer length (CVE-2026-64319)

    * kernel: dm-verity: fix buffer overflow in FEC calculation (CVE-2026-72098)

    * kernel: selinux: check connect-related permissions on TCP Fast Open (CVE-2026-72243)

    * kernel: ALSA: usx2y: bound the hwdep mmap fault offset (CVE-2026-74641)

    * kernel: ipv6: fix use-after-free in ip6_finish_output2() (CVE-2026-80792)

    * kernel: scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read (CVE-2026-89846)

    * kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation ()

    Bug Fix(es) and Enhancement(s):

    * BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580 (JIRA:RHEL-242997)

    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=2395363");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2425039");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2464455");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2468228");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2479812");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2482566");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2492364");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2492769");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2492771");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502243");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502251");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502326");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502327");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502330");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502369");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502395");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2502449");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2507096");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2516501");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2516684");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2521436");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2528542");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2535391");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2540872");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_92993.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3473f74f");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:92993");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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-2026-43020");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(20, 120, 125, 130, 190, 366, 551, 770, 787, 805, 820, 825);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/30");

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  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_info2.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");

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}


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: 'eq', os_version: os_version, rhel_version: '9.2')) audit(AUDIT_OS_NOT, 'Red Hat 9.2', '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);

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-2022-50315', 'CVE-2025-68745', 'CVE-2026-43020', 'CVE-2026-43450', 'CVE-2026-43493', 'CVE-2026-46149', 'CVE-2026-52972', 'CVE-2026-53224', 'CVE-2026-53246', 'CVE-2026-63802', 'CVE-2026-63831', 'CVE-2026-63920', 'CVE-2026-63922', 'CVE-2026-63924', 'CVE-2026-63984', 'CVE-2026-63993', 'CVE-2026-64017', 'CVE-2026-64319', 'CVE-2026-72098', 'CVE-2026-72243', 'CVE-2026-74641', 'CVE-2026-80792', 'CVE-2026-89846');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, livepatch_source + ' hotfix for RHSA-2026:92993');
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

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    'sp': '2',
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      'content/aus/rhel9/9.2/x86_64/appstream/source/SRPMS',
      'content/e4s/rhel9/9.2/aarch64/appstream/debug',
      'content/e4s/rhel9/9.2/aarch64/appstream/os',
      'content/e4s/rhel9/9.2/aarch64/appstream/source/SRPMS',
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    'pkgs': [
      {'reference':'bpftool-7.0.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-debug-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-debug-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-debug-modules-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-debug-modules-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-debug-modules-extra-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-modules-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-modules-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-64k-modules-extra-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-modules-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-modules-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-modules-extra-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-uki-virt-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-modules-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-modules-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-modules-extra-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-5.14.0-284.200.1.el9_2', 'sp':'2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-libs-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-libs-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'ppc64le', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-libs-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-uki-virt-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-zfcpdump-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-zfcpdump-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-zfcpdump-modules-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-zfcpdump-modules-core-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-zfcpdump-modules-extra-5.14.0-284.200.1.el9_2', 'sp':'2', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-perf-5.14.0-284.200.1.el9_2', 'sp':'2', '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;
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'];

  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 &&
        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++;
  }
}

if (flag)
{
  var subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Update Services for SAP Solutions repository.\n' +
    'Access to this repository requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'bpftool / kernel / kernel-64k / kernel-64k-core / kernel-64k-debug / etc');
}