CVE-2026-23293

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23293
In the Linux kernel, the following vulnerability has been resolved: net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which initializes it. If an IPv6 packet is injected into the interface, route_shortcircuit() is called and a NULL pointer dereference happens on neigh_lookup(). BUG: kernel NULL pointer dereference, address: 0000000000000380 Oops: Oops: 0000 [#1] SMP NOPTI [...] RIP: 0010:neigh_lookup+0x20/0x270 [...] Call Trace: <TASK> vxlan_xmit+0x638/0x1ef0 [vxlan] dev_hard_start_xmit+0x9e/0x2e0 __dev_queue_xmit+0xbee/0x14e0 packet_sendmsg+0x116f/0x1930 __sys_sendto+0x1f5/0x200 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x12f/0x1590 entry_SYSCALL_64_after_hwframe+0x76/0x7e Fix this by adding an early check on route_shortcircuit() when protocol is ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because VXLAN can be built-in even when IPv6 is built as a module.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e Patch
https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434 Patch
https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0 Patch
https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd Patch
https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45 Patch
https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc Patch
https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 Patch
https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
History

29 May 2026, 15:04

Type Values Removed Values Added
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e - () https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e - Patch
References () https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434 - () https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434 - Patch
References () https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0 - () https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0 - Patch
References () https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd - () https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd - Patch
References () https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45 - () https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45 - Patch
References () https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc - () https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc - Patch
References () https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 - () https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 - Patch
References () https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb - () https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb - Patch
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*

18 Apr 2026, 09:16

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: net: vxlan: corrige la desreferencia de puntero NULL de nd_tbl cuando IPv6 está deshabilitado Al arrancar con el parámetro 'ipv6.disable=1', nd_tbl nunca se inicializa porque inet6_init() sale antes de que se llame a ndisc_init(), que es la función que lo inicializa. Si se inyecta un paquete IPv6 en la interfaz, se llama a route_shortcircuit() y ocurre una desreferencia de puntero NULL en neigh_lookup(). BUG: desreferencia de puntero NULL del kernel, dirección: 0000000000000380 Oops: Oops: 0000 [#1] SMP NOPTI [...] RIP: 0010:neigh_lookup+0x20/0x270 [...] Traza de Llamadas: vxlan_xmit+0x638/0x1ef0 [vxlan] dev_hard_start_xmit+0x9e/0x2e0 __dev_queue_xmit+0xbee/0x14e0 packet_sendmsg+0x116f/0x1930 __sys_sendto+0x1f5/0x200 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x12f/0x1590 entry_SYSCALL_64_after_hwframe+0x76/0x7e Esto se corrige añadiendo una verificación temprana en route_shortcircuit() cuando el protocolo es ETH_P_IPV6. Tenga en cuenta que ipv6_mod_enabled() no se puede usar aquí porque VXLAN puede estar integrado incluso cuando IPv6 se compila como un módulo.
References
  • () https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0 -
  • () https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc -

25 Mar 2026, 11:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-25 11:16

Updated : 2026-05-29 15:04

NVD link : CVE-2026-23293

Mitre link : CVE-2026-23293

CVE.ORG link : CVE-2026-23293

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference