CVE-2022-4696

There exists a use-after-free vulnerability in the Linux kernel through io_uring and the IORING_OP_SPLICE operation. If IORING_OP_SPLICE is missing the IO_WQ_WORK_FILES flag, which signals that the operation won't use current->nsproxy, so its reference counter is not increased. This assumption is not always true as calling io_splice on specific files will call the get_uts function which will use current->nsproxy leading to invalidly decreasing its reference counter later causing the use-after-free vulnerability. We recommend upgrading to version 5.10.160 or above

There exists a use-after-free vulnerability in the Linux kernel through io_uring and the IORING_OP_SPLICE operation. If IORING_OP_SPLICE is missing the IO_WQ_WORK_FILES flag, which signals that the operation won't use current->nsproxy, so its reference counter is not increased. This assumption is not always true as calling io_splice on specific files will call the get_uts function which will use current->nsproxy leading to invalidly decreasing its reference counter later causing the use-after-free vulnerability. We recommend upgrading to version 5.10.160 or above

Existe una vulnerabilidad de use-after-free en el kernel de Linux a través de io_uring y la operación IORING_OP_SPLICE. Si a IORING_OP_SPLICE le falta el indicador IO_WQ_WORK_FILES, que indica que la operación no utilizará current->nsproxy, por lo que su contador de referencia no aumenta. Esta suposición no siempre es cierta, ya que llamar a io_splice en archivos específicos llamará a la función get_uts, que utilizará current->nsproxy, lo que provocará una disminución no válida de su contador de referencia y luego provocará la vulnerabilidad de use-after-free. Recomendamos actualizar a la versión 5.10.160 o superior