Siemens RUGGEDCOM RST2428P Improper Input Validation (CVE-2026-23025)

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

include('compat.inc');

if (description)
{
  script_id(505443);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/17");

  script_cve_id("CVE-2026-23025");
  script_xref(name:"ICSA", value:"26-188-05");

  script_name(english:"Siemens RUGGEDCOM RST2428P Improper Input Validation (CVE-2026-23025)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"In the Linux kernel, the following vulnerability has been resolved:
mm/page_alloc: prevent pcp corruption with SMP=n    The kernel test
robot has reported:     BUG: spinlock trylock failure on UP on CPU#0,
kcompactd0/28    lock: 0xffff888807e35ef0, .magic: dead4ead, .owner:
kcompactd0/28, .owner_cpu: 0   CPU: 0 UID: 0 PID: 28 Comm: kcompactd0
Not tainted 6.18.0-rc5-00127-ga06157804399 #1 PREEMPT
8cc09ef94dcec767faa911515ce9e609c45db470   Call Trace:    <IRQ>
__dump_stack (lib/dump_stack.c:95)    dump_stack_lvl
(lib/dump_stack.c:123)    dump_stack (lib/dump_stack.c:130)
spin_dump (kernel/locking/spinlock_debug.c:71)    do_raw_spin_trylock
(kernel/locking/spinlock_debug.c:?)    _raw_spin_trylock
(include/linux/spinlock_api_smp.h:89 kernel/locking/spinlock.c:138)
__free_frozen_pages (mm/page_alloc.c:2973)    ___free_pages
(mm/page_alloc.c:5295)    __free_pages (mm/page_alloc.c:5334)
tlb_remove_table_rcu (include/linux/mm.h:? include/linux/mm.h:3122
include/asm-generic/tlb.h:220 mm/mmu_gather.c:227 mm/mmu_gather.c:290)
? __cfi_tlb_remove_table_rcu (mm/mmu_gather.c:289)    ? rcu_core
(kernel/rcu/tree.c:?)    rcu_core (include/linux/rcupdate.h:341
kernel/rcu/tree.c:2607 kernel/rcu/tree.c:2861)    rcu_core_si
(kernel/rcu/tree.c:2879)    handle_softirqs
(arch/x86/include/asm/jump_label.h:36 include/trace/events/irq.h:142
kernel/softirq.c:623)    __irq_exit_rcu
(arch/x86/include/asm/jump_label.h:36 kernel/softirq.c:725)
irq_exit_rcu (kernel/softirq.c:741)    sysvec_apic_timer_interrupt
(arch/x86/kernel/apic/apic.c:1052)    </IRQ>    <TASK>   RIP:
0010:_raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:95
include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)
free_pcppages_bulk (mm/page_alloc.c:1494)    drain_pages_zone
(include/linux/spinlock.h:391 mm/page_alloc.c:2632)
__drain_all_pages (mm/page_alloc.c:2731)    drain_all_pages
(mm/page_alloc.c:2747)    kcompactd (mm/compaction.c:3115)    kthread
(kernel/kthread.c:465)    ? __cfi_kcompactd (mm/compaction.c:3166)
? __cfi_kthread (kernel/kthread.c:412)    ret_from_fork
(arch/x86/kernel/process.c:164)    ? __cfi_kthread
(kernel/kthread.c:412)    ret_from_fork_asm
(arch/x86/entry/entry_64.S:255)    </TASK>    Matthew has analyzed the
report and identified that in drain_page_zone()  we are in a section
protected by spin_lock(&pcp->lock) and then get an  interrupt that
attempts spin_trylock() on the same lock.  The code is  designed to
work this way without disabling IRQs and occasionally fail the
trylock with a fallback.  However, the SMP=n spinlock implementation
assumes spin_trylock() will always succeed, and thus it's normally a
no-op.  Here the enabled lock debugging catches the problem, but
otherwise  it could cause a corruption of the pcp structure.    The
problem has been introduced by commit 574907741599 (mm/page_alloc:
leave IRQs enabled for per-cpu page allocations).  The pcp locking
scheme  recognizes the need for disabling IRQs to prevent nesting
spin_trylock()  sections on SMP=n, but the need to prevent the nesting
in spin_lock() has  not been recognized.  Fix it by introducing local
wrappers that change the  spin_lock() to spin_lock_iqsave() with SMP=n
and use them in all places  that do spin_lock(&pcp->lock).
[[email protected]: add pcp_ prefix to the spin_lock_irqsave wrappers,
per Steven]

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-253495.html");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/110002573/");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/ICSA-26-188-05");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  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-2026-23025");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/31");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/18");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:ruggedcom_rst2428p_firmware");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Siemens");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

var asset = tenable_ot::assets::get(vendor:'Siemens');

var vuln_cpes = {
    "cpe:/o:siemens:ruggedcom_rst2428p_firmware" :
        {"family" : "RuggedCom", "orderNumbers" : ['6GK6242-6PA00'], "versionEndExcluding" : "4.0"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);