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.
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->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->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->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->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->mesh_config al principio de mesh_matches_local() para devolver falso anticipadamente cuando el IE de Configuración de Malla está ausente.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-476
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340a52cc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd2d3af5fc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd369a4e6c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd38676f740> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340a50740> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340a50a80> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd34011cdc0> | Operating System |
| linux | linux_kernel | 2.6.26 | <built-in method update of dict object at 0x7fd30868a900> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7fd34011e3c0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7fd340a51700> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7fd369a4c780> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7fd369a4da40> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7fd2d24ecbc0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7fd34bb9ddc0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7fd34bb9f600> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:2.6.26:-:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* |