CVE-2024-42285
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
In the Linux kernel, in the RDMA/iwcm subsystem, there is a use-after-free vulnerability related to destroying CM IDs. iw_conn_req_handler() associates a new rdma_id_private with an existing iw_cm_id, and rdma_destroy_id() frees both. The fix ensures that cm_work_handler() does not trigger use-after-free by waiting for all pending work to finish before freeing rdma_id_private.
Risk Assessment
A use-after-free vulnerability can lead to system crashes, malfunction, or potential code execution by an attacker. This affects systems using RDMA.
Recommendation
It is recommended to update the Linux kernel to a version containing the fix that resolves the use-after-free issue in RDMA/iwcm.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: RDMA/iwcm: Fix a use-after-free related to destroying CM IDs iw_conn_req_handler() associates a new struct rdma_id_private (conn_id) with an existing struct iw_cm_id (cm_id) as follows: conn_id->cm_id.iw = cm_id; cm_id->context = conn_id; cm_id->cm_handler = cma_iw_handler; rdma_destroy_id() frees both the cm_id and the struct rdma_id_private. Make sure that cm_work_handler() does not trigger a use-after-free by only freeing of the struct rdma_id_private after all pending work has finished.