Acknowledged
Created: Feb 27, 2025
Updated: Jun 17, 2025
Found In Version: 10.21.20.1
Severity: Standard
Applicable for: Wind River Linux LTS 21
Component/s: Kernel
In the Linux kernel, the following vulnerability has been resolved:nbd: don't allow reconnect after disconnectFollowing process can cause nbd_config UAF:1) grab nbd_config temporarily;2) nbd_genl_disconnect() flush all recv_work() and release theinitial reference: nbd_genl_disconnect nbd_disconnect_and_put nbd_disconnect flush_workqueue(nbd->recv_workq) if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF, ...)) nbd_config_put -> due to step 1), reference is still not zero3) nbd_genl_reconfigure() queue recv_work() again; nbd_genl_reconfigure config = nbd_get_config_unlocked(nbd) if (!config) -> succeed if (!test_bit(NBD_RT_BOUND, ...)) -> succeed nbd_reconnect_socket queue_work(nbd->recv_workq, &args->work)4) step 1) release the reference;5) Finially, recv_work() will trigger UAF: recv_work nbd_config_put(nbd) -> nbd_config is freed atomic_dec(&config->recv_threads) -> UAFFix the problem by clearing NBD_RT_BOUND in nbd_genl_disconnect(), sothat nbd_genl_reconfigure() will fail.
CREATE(Triage):(User=admin) CVE-2025-21731 (https://nvd.nist.gov/vuln/detail/CVE-2025-21731)
