In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.
En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: netfilter: nf_tables: liberar la tabla de flujos después del período de gracia de RCU en caso de error Llamar a synchronize_rcu() después de desregistrar los hooks de la ruta de error, ya que un hook que ya se refiere a esta tabla de flujos puede estar ya registrado, exponiendo esta tabla de flujos a la ruta de paquetes y al plano de control de nfnetlink_hook. Esta ruta de error es rara, solo debería ocurrir al alcanzar el número máximo de hooks o al fallar la configuración para la descarga de hardware; simplemente llamar a synchronize_rcu(). Existe una comprobación para hooks de dispositivo ya utilizados por una tabla de flujos diferente que podría resultar en EEXIST en esta etapa tardía. El analizador de hooks puede ser actualizado para realizar esta comprobación antes, para que esta ruta de error realmente se ejercite raramente. Descubierto por KASAN, reportado como uso después de liberación desde la ruta de nfnetlink_hook al volcar los hooks.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | HIGH |
| Availability Impact | HIGH |
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Type: Secondary
Exploitability Score: 1.8
Impact Score: 5.9
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-416
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a5974100> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2424593cc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d242a707900> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2424458040> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a59764c0> | Operating System |
| linux | linux_kernel | 4.16 | <built-in method update of dict object at 0x7d23a5977640> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d242434de40> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23a59c8800> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d242a8c8680> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23a59772c0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23afb19ec0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d2424646c80> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d24243dd600> | 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:4.16:-:*:*:*:*:*:* |
| 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:*:*:*:*:*:* |