CVE-2026-23396

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23396
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix NULL deref in mesh_matches_local() mesh_matches_local() unconditionally dereferences ie->mesh_config to compare mesh configuration parameters. When called from mesh_rx_csa_frame(), the parsed action-frame elements may not contain a Mesh Configuration IE, leaving ie->mesh_config NULL and triggering a kernel NULL pointer dereference. The other two callers are already safe: - ieee80211_mesh_rx_bcn_presp() checks !elems->mesh_config before calling mesh_matches_local() - mesh_plink_get_event() is only reached through mesh_process_plink_frame(), which checks !elems->mesh_config, too mesh_rx_csa_frame() is the only caller that passes raw parsed elements to mesh_matches_local() without guarding mesh_config. An adjacent attacker can exploit this by sending a crafted CSA action frame that includes a valid Mesh ID IE but omits the Mesh Configuration IE, crashing the kernel. The captured crash log: Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: events_unbound cfg80211_wiphy_work [...] Call Trace: <TASK> ? __pfx_mesh_matches_local (net/mac80211/mesh.c:65) ieee80211_mesh_rx_queued_mgmt (net/mac80211/mesh.c:1686) [...] ieee80211_iface_work (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802) [...] cfg80211_wiphy_work (net/wireless/core.c:426) process_one_work (net/kernel/workqueue.c:3280) ? assign_work (net/kernel/workqueue.c:1219) worker_thread (net/kernel/workqueue.c:3352) ? __pfx_worker_thread (net/kernel/workqueue.c:3385) kthread (net/kernel/kthread.c:436) [...] ret_from_fork_asm (net/arch/x86/entry/entry_64.S:255) </TASK> This patch adds a NULL check for ie->mesh_config at the top of mesh_matches_local() to return false early when the Mesh Configuration IE is absent.

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/0a4da176ae4b4e075a19c00d3e269cfd5e05a813 Patch
https://git.kernel.org/stable/c/14a4fd13657a3f2489db6566f081adfb27a49c64 Patch
https://git.kernel.org/stable/c/44699c6cdfce80a0f296b54ae9314461e3e41b3d Patch
https://git.kernel.org/stable/c/74de6fa472b03bc8cde0a081484e9960bcbda568 Patch
https://git.kernel.org/stable/c/7c55a3deaf7eaaafa2546f8de7fed19382a0a116 Patch
https://git.kernel.org/stable/c/a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004 Patch
https://git.kernel.org/stable/c/c1e3f2416fb27c816ce96d747d3e784e31f4d95c Patch
https://git.kernel.org/stable/c/c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd 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:2.6.26:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
History

24 Apr 2026, 15:18

Type Values Removed Values Added
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.26:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/0a4da176ae4b4e075a19c00d3e269cfd5e05a813 - () https://git.kernel.org/stable/c/0a4da176ae4b4e075a19c00d3e269cfd5e05a813 - Patch
References () https://git.kernel.org/stable/c/14a4fd13657a3f2489db6566f081adfb27a49c64 - () https://git.kernel.org/stable/c/14a4fd13657a3f2489db6566f081adfb27a49c64 - Patch
References () https://git.kernel.org/stable/c/44699c6cdfce80a0f296b54ae9314461e3e41b3d - () https://git.kernel.org/stable/c/44699c6cdfce80a0f296b54ae9314461e3e41b3d - Patch
References () https://git.kernel.org/stable/c/74de6fa472b03bc8cde0a081484e9960bcbda568 - () https://git.kernel.org/stable/c/74de6fa472b03bc8cde0a081484e9960bcbda568 - Patch
References () https://git.kernel.org/stable/c/7c55a3deaf7eaaafa2546f8de7fed19382a0a116 - () https://git.kernel.org/stable/c/7c55a3deaf7eaaafa2546f8de7fed19382a0a116 - Patch
References () https://git.kernel.org/stable/c/a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004 - () https://git.kernel.org/stable/c/a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004 - Patch
References () https://git.kernel.org/stable/c/c1e3f2416fb27c816ce96d747d3e784e31f4d95c - () https://git.kernel.org/stable/c/c1e3f2416fb27c816ce96d747d3e784e31f4d95c - Patch
References () https://git.kernel.org/stable/c/c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd - () https://git.kernel.org/stable/c/c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd - Patch
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

18 Apr 2026, 09:16

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/14a4fd13657a3f2489db6566f081adfb27a49c64 -
  • () https://git.kernel.org/stable/c/74de6fa472b03bc8cde0a081484e9960bcbda568 -

30 Mar 2026, 13:26

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: wifi: mac80211: corrige desreferencia de NULL en mesh_matches_local() mesh_matches_local() desreferencia incondicionalmente ie-&gt;mesh_config para comparar los parámetros de configuración de malla. Cuando se llama desde mesh_rx_csa_frame(), los elementos de la trama de acción analizados pueden no contener un IE de Configuración de Malla, dejando ie-&gt;mesh_config como NULL y desencadenando una desreferencia de puntero NULL del kernel. Los otros dos llamadores ya son seguros: - ieee80211_mesh_rx_bcn_presp() comprueba !elems-&gt;mesh_config antes de llamar a mesh_matches_local() - mesh_plink_get_event() solo se alcanza a través de mesh_process_plink_frame(), que también comprueba !elems-&gt;mesh_config mesh_rx_csa_frame() es el único llamador que pasa elementos analizados en bruto a mesh_matches_local() sin proteger mesh_config. Un atacante adyacente puede explotar esto enviando una trama de acción CSA manipulada que incluye un IE de ID de Malla válido pero omite el IE de Configuración de Malla, provocando el fallo del kernel. El registro de fallo capturado: Oops: fallo de protección general, probablemente para dirección no canónica ... KASAN: desreferencia de puntero nulo en el rango [0x0000000000000000-0x0000000000000007] Cola de trabajo: events_unbound cfg80211_wiphy_work [...] Traza de Llamada: ? __pfx_mesh_matches_local (net/mac80211/mesh.c:65) ieee80211_mesh_rx_queued_mgmt (net/mac80211/mesh.c:1686) [...] ieee80211_iface_work (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802) [...] cfg80211_wiphy_work (net/wireless/core.c:426) process_one_work (net/kernel/workqueue.c:3280) ? assign_work (net/kernel/workqueue.c:1219) worker_thread (net/kernel/workqueue.c:3352) ? __pfx_worker_thread (net/kernel/workqueue.c:3385) kthread (net/kernel/kthread.c:436) [...] ret_from_fork_asm (net/arch/x86/entry/entry_64.S:255) Este parche añade una comprobación de NULL para ie-&gt;mesh_config al principio de mesh_matches_local() para devolver falso anticipadamente cuando el IE de Configuración de Malla está ausente.

26 Mar 2026, 11:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-26 11:16

Updated : 2026-04-24 15:18

NVD link : CVE-2026-23396

Mitre link : CVE-2026-23396

CVE.ORG link : CVE-2026-23396

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference