Siemens RUGGEDCOM RST2428P Improper Input Validation (CVE-2025-39913)

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

include('compat.inc');

if (description)
{
  script_id(505435);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/17");

  script_cve_id("CVE-2025-39913");
  script_xref(name:"ICSA", value:"26-188-05");

  script_name(english:"Siemens RUGGEDCOM RST2428P Improper Input Validation (CVE-2025-39913)");

  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:
tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to
allocate psock->cork.  syzbot reported the splat below. [0]  The repro
does the following:    1. Load a sk_msg prog that calls
bpf_msg_cork_bytes(msg, cork_bytes)   2. Attach the prog to a SOCKMAP
3. Add a socket to the SOCKMAP   4. Activate fault injection   5. Send
data less than cork_bytes  At 5., the data is carried over to the next
sendmsg() as it is smaller than the cork_bytes specified by
bpf_msg_cork_bytes().  Then, tcp_bpf_send_verdict() tries to allocate
psock->cork to hold the data, but this fails silently due to fault
injection + __GFP_NOWARN.  If the allocation fails, we need to revert
the sk->sk_forward_alloc change done by sk_msg_alloc().  Let's call
sk_msg_free() when tcp_bpf_send_verdict fails to allocate psock->cork.
The *copied also needs to be updated such that a proper error can be
returned to the caller, sendmsg. It fails to allocate psock->cork.
Nothing has been corked so far, so this patch simply sets *copied to
0.  [0]: WARNING: net/ipv4/af_inet.c:156 at
inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156, CPU#1: syz-
executor/5983 Modules linked in: CPU: 1 UID: 0 PID: 5983 Comm: syz-
executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google
Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:inet_sock_destruct+0x623/0x730 net/ipv4/af_inet.c:156 Code:
0f 0b 90 e9 62 fe ff ff e8 7a db b5 f7 90 0f 0b 90 e9 95 fe ff ff e8
6c db b5 f7 90 0f 0b 90 e9 bb fe ff ff e8 5e db b5 f7 90 <0f> 0b 90 e9
e1 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 9f fc RSP:
0018:ffffc90000a08b48 EFLAGS: 00010246 RAX: ffffffff8a09d0b2 RBX:
dffffc0000000000 RCX: ffff888024a23c80 RDX: 0000000000000100 RSI:
0000000000000fff RDI: 0000000000000000 RBP: 0000000000000fff R08:
ffff88807e07c627 R09: 1ffff1100fc0f8c4 R10: dffffc0000000000 R11:
ffffed100fc0f8c5 R12: ffff88807e07c380 R13: dffffc0000000000 R14:
ffff88807e07c60c R15: 1ffff1100fc0f872 FS:  00005555604c4500(0000)
GS:ffff888125af1000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000
ES: 0000 CR0: 0000000080050033 CR2: 00005555604df5c8 CR3:
0000000032b06000 CR4: 00000000003526f0 Call Trace:  <IRQ>
__sk_destruct+0x86/0x660 net/core/sock.c:2339  rcu_do_batch
kernel/rcu/tree.c:2605 [inline]  rcu_core+0xca8/0x1770
kernel/rcu/tree.c:2861  handle_softirqs+0x286/0x870
kernel/softirq.c:579  __do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680  irq_exit_rcu+0x9/0x30
kernel/softirq.c:696  instr_sysvec_apic_timer_interrupt
arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
</IRQ>

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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-39913");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/10/01");
  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);