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net: Stack Overflow with Ping (to own IP Address) via Shell

Moderate
ceolin published GHSA-6fcc-8rwr-w7xx May 12, 2026

Package

zephyr (zephyr)

Affected versions

<= 4.3

Patched versions

None

Description

Ping to self via net shell net ping 10.42.0.2 causes a stack overflow in samples/net/sockets/echo_server. Own IPv4 address is configured via CONFIG_NET_CONFIG_MY_IPV4_ADDR="10.42.0.2".

Zephyr version: 7823374e872 release: Zephyr 4.1.0

Build with: west build --pristine -b frdm_k64f -d "k64_echo_server" samples/net/sockets/echo_server -- -DOVERLAY_CONFIG="prj.conf"

Additional Details:


bt

#0  0x000005b8 in __udivmoddi4 ()
#1  0x00000574 in __aeabi_uldivmod ()
#2  0x00028010 in __ultoa_invert ()
#3  0x0001ea36 in vfprintf ()
#4  0x0001dfbc in snprintf ()
#5  0x00000a58 in handle_ipv4_echo_reply (ctx=<optimized out>, pkt=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>, hdr=<optimized out>, icmp_hdr=<optimized out>,
   user_data=0x20008258 <ping_ctx>) at zephyr/subsys/net/lib/shell/ping.c:156
#6  0x000128fc in icmp_call_handlers (pkt=pkt@entry=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>, ip_hdr=ip_hdr@entry=0x20024318 <sys_work_q_stack+408>,
   icmp_hdr=icmp_hdr@entry=0x20024ed0 <net_buf_data_tx_bufs+148>) at zephyr/subsys/net/ip/icmp.c:523
#7  0x0002464c in net_icmp_call_ipv4_handlers (pkt=pkt@entry=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>, ipv4_hdr=ipv4_hdr@entry=0x20024ebc <net_buf_data_tx_bufs+128>,
   icmp_hdr=icmp_hdr@entry=0x20024ed0 <net_buf_data_tx_bufs+148>) at zephyr/subsys/net/ip/icmp.c:546
#8  0x000137f4 in net_icmpv4_input (pkt=pkt@entry=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>, ip_hdr=ip_hdr@entry=0x20024ebc <net_buf_data_tx_bufs+128>)
   at zephyr/subsys/net/ip/icmpv4.c:643
#9  0x00013a2c in net_ipv4_input (pkt=pkt@entry=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>, is_loopback=is_loopback@entry=true)
   at zephyr/subsys/net/ip/ipv4.c:388
#10 0x0000e07e in process_data (is_loopback=is_loopback@entry=true, pkt=pkt@entry=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>) at zephyr/subsys/net/ip/net_core.c:142
#11 processing_data (pkt=pkt@entry=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>, is_loopback=is_loopback@entry=true) at zephyr/subsys/net/ip/net_core.c:160
#12 0x0000e16e in net_send_data (pkt=pkt@entry=0x20029d14 <_k_mem_slab_buf_tx_pkts+216>) at zephyr/subsys/net/ip/net_core.c:405
#13 0x00013640 in icmpv4_handle_echo_request (ctx=<optimized out>, pkt=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>, hdr=<optimized out>, icmp_hdr=<optimized out>, user_data=0x0 <l4_event_handler>) at zephyr/subsys/net/ip/icmpv4.c:496
#14 0x000128fc in icmp_call_handlers (pkt=pkt@entry=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>, ip_hdr=ip_hdr@entry=0x20024428 <sys_work_q_stack+680>, icmp_hdr=icmp_hdr@entry=0x20024e50 <net_buf_data_tx_bufs+20>) at zephyr/subsys/net/ip/icmp.c:523
#15 0x0002464c in net_icmp_call_ipv4_handlers (pkt=pkt@entry=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>, ipv4_hdr=ipv4_hdr@entry=0x20024e3c <net_buf_data_tx_bufs>, icmp_hdr=icmp_hdr@entry=0x20024e50 <net_buf_data_tx_bufs+20>) at zephyr/subsys/net/ip/icmp.c:546
#16 0x000137f4 in net_icmpv4_input (pkt=pkt@entry=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>, ip_hdr=ip_hdr@entry=0x20024e3c <net_buf_data_tx_bufs>) at zephyr/subsys/net/ip/icmpv4.c:643
#17 0x00013a2c in net_ipv4_input (pkt=pkt@entry=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>, is_loopback=is_loopback@entry=true) at zephyr/subsys/net/ip/ipv4.c:388
#18 0x0000e07e in process_data (is_loopback=is_loopback@entry=true, pkt=pkt@entry=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>) at zephyr/subsys/net/ip/net_core.c:142
#19 processing_data (pkt=pkt@entry=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>, is_loopback=is_loopback@entry=true) at zephyr/subsys/net/ip/net_core.c:160
#20 0x0000e16e in net_send_data (pkt=pkt@entry=0x20029ccc <_k_mem_slab_buf_tx_pkts+144>) at zephyr/subsys/net/ip/net_core.c:405
#21 0x00012a5c in send_icmpv6_echo_request (timeout=..., user_data=<optimized out>, params=<optimized out>, dst=<optimized out>, iface=<optimized out>, ctx=<optimized out>) at zephyr/subsys/net/ip/icmp.c:333
#22 net_icmp_send_echo_request_timeout (ctx=ctx@entry=0x20008288 <ping_ctx+48>, iface=0x20004128 <__net_if_dts_ord_95_0>, dst=dst@entry=0x2000829c <ping_ctx+68>, params=params@entry=0x2002455c <sys_work_q_stack+988>, user_data=user_data@entry=0x20008258 <ping_ctx>, timeout=...) at zephyr/subsys/net/ip/icmp.c:469
#23 0x00024638 in net_icmp_send_echo_request_no_wait (ctx=ctx@entry=0x20008288 <ping_ctx+48>, iface=<optimized out>, dst=dst@entry=0x2000829c <ping_ctx+68>, params=params@entry=0x2002455c <sys_work_q_stack+988>, user_data=user_data@entry=0x20008258 <ping_ctx>) at zephyr/subsys/net/ip/icmp.c:496
#24 0x0000b9c8 in ping_work (work=0x20008258 <ping_ctx>) at zephyr/subsys/net/lib/shell/ping.c:275
#25 0x0001c986 in work_queue_main (workq_ptr=0x20008c30 <k_sys_work_q>, p2=<optimized out>, p3=<optimized out>) at zephyr/kernel/work.c:684
#26 0x00002356 in z_thread_entry (entry=0x1c8f5 <work_queue_main>, p1=0x20008c30 <k_sys_work_q>, p2=0x0 <l4_event_handler>, p3=0x0 <l4_event_handler>) at zephyr/lib/os/thread_entry.c:48
#27 0xaaaaaaaa in ?? ()
  • At this point stack limit is reached when entering __udivmoddi4 ()

print $sp
$3 = (void *) 0x200241c0 <sys_work_q_stack+64>
  • Upon executing the next instruction we get:

uart:~$ net ping 10.42.0.2
PING 10.42.0.2
[00:00:19.156,000] <err> os: ***** BUS FAULT *****
[00:00:19.156,000] <err> os:   Stacking error
[00:00:19.156,000] <err> os:   Imprecise data bus error
[00:00:19.156,000] <err> os:   NXP MPU error, port 3
[00:00:19.156,000] <err> os:     Mode: Supervisor, Data Address: 0x20024198
[00:00:19.157,000] <err> os:     Type: Write, Master: 0, Regions: 0x8200
[00:00:19.157,000] <err> os: r0/a1:  0x4f7ad738  r1/a2: 0xa104d5cc  r2/a3:  0x012e4b3b
[00:00:19.157,000] <err> os: r3/a4:  0x49ca0d82 r12/ip: 0xf7306909 r14/lr:  0x1c4cdc1b
[00:00:19.157,000] <err> os:  xpsr:  0x562c9c00
[00:00:19.157,000] <err> os: Faulting instruction address (r15/pc): 0xeac9f934
[00:00:19.157,000] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
[00:00:19.157,000] <err> os: Current thread: 0x20008c30 (sysworkq)
[00:00:19.278,000] <err> os: Halting system
  • Understanding of the issue:

  1. net ping 10.42.0.2 leads to sending an echo request from work queue.

  2. When the packet is about to be written to network, Zephyr realizes that the destination IP address is my own. So, let's process it immediately.

  3. Handle echo request.

  4. Send reply of echo request.

  5. Again, when the packet is about to be written to network, Zephyr realizes that the destination IP address is my own. So, let's process it immediately.

  6. Handle echo reply.

=>The stack grows bigger than the available space during this handling and consequently MPU detects the overwrite.

Patches

main: #102268

For more information

If you have any questions or comments about this advisory:

embargo: 2026-04-15

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

CVE ID

CVE-2026-1681

Weaknesses

Uncontrolled Recursion

The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Learn more on MITRE.