In the Linux kernel, the following vulnerability has been resolved: bcache: fix variable length array abuse in btree_iter btree_iter is used in two ways: either allocated on the stack with a fixed size MAX_BSETS, or from a mempool with a dynamic size based on the specific cache set. Previously, the struct had a fixed-length array of size MAX_BSETS which was indexed out-of-bounds for the dynamically-sized iterators, which causes UBSAN to complain. This patch uses the same approach as in bcachefs's sort_iter and splits the iterator into a btree_iter with a flexible array member and a btree_iter_stack which embeds a btree_iter as well as a fixed-length data array.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bcache: corrige el abuso de matriz de longitud variable en btree_iter btree_iter se usa de dos maneras: ya sea asignado en la pila con un tamaño fijo MAX_BSETS, o desde un mempool con un tamaño dinámico basado en el conjunto de caché específico. Anteriormente, la estructura tenía una matriz de longitud fija de tamaño MAX_BSETS que estaba indexada fuera de los límites para los iteradores de tamaño dinámico, lo que provoca que UBSAN se queje. Este parche utiliza el mismo enfoque que en sort_iter de bcachefs y divide el iterador en un btree_iter con un miembro de matriz flexible y un btree_iter_stack que incorpora un btree_iter así como una matriz de datos de longitud fija.
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-770
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd3854df380> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd38493e880> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340ad9b80> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd384e12dc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd384dd5940> | 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:*:*:*:*:*:*:*:* |