CVE-2025-38211: In the Linux kernel, the following vulnerability has been resolved:  RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction  The commit 59c68ac31e15 ("iw_cm: free cm_id resources on the last deref") simplified cm_id resource management by freeing cm_id once all references to the cm_id were removed. The references are removed either upon completion of iw_cm event handlers or when the application destroys the cm_id. This commit introduced the use-after-free condition where cm_id_private object could still be in use by event handler works during the destruction of cm_id. The commit aee2424246f9 ("RDMA/iwcm: Fix a use-after-free related to destroying CM IDs") addressed this use-after- free by flushing all pending works at the cm_id destruction.  However, still another use-after-free possibility remained. It happens with the work objects allocated for each cm_id_priv within alloc_work_entries() during cm_id creation, and subsequently freed in dealloc_work_entries() once all references to the cm_id are removed. If the cm_id's last reference is decremented in the event handler work, the work object for the work itself gets removed, and causes the use- after-free BUG below:    BUG: KASAN: slab-use-after-free in __pwq_activate_work+0x1ff/0x250   Read of size 8 at addr ffff88811f9cf800 by task kworker/u16:1/147091    CPU: 2 UID: 0 PID: 147091 Comm: kworker/u16:1 Not tainted 6.15.0-rc2+ #27 PREEMPT(voluntary)   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014   Workqueue:  0x0 (iw_cm_wq)   Call Trace:    <TASK>    dump_stack_lvl+0x6a/0x90    print_report+0x174/0x554    ? __virt_addr_valid+0x208/0x430    ? __pwq_activate_work+0x1ff/0x250    kasan_report+0xae/0x170    ? __pwq_activate_work+0x1ff/0x250    __pwq_activate_work+0x1ff/0x250    pwq_dec_nr_in_flight+0x8c5/0xfb0    process_one_work+0xc11/0x1460    ? __pfx_process_one_work+0x10/0x10    ? assign_work+0x16c/0x240    worker_thread+0x5ef/0xfd0    ? __pfx_worker_thread+0x10/0x10    kthread+0x3b0/0x770    ? __pfx_kthread+0x10/0x10    ? rcu_is_watching+0x11/0xb0    ? _raw_spin_unlock_irq+0x24/0x50    ? rcu_is_watching+0x11/0xb0    ? __pfx_kthread+0x10/0x10    ret_from_fork+0x30/0x70    ? __pfx_kthread+0x10/0x10    ret_from_fork_asm+0x1a/0x30    </TASK>    Allocated by task 147416:    kasan_save_stack+0x2c/0x50    kasan_save_track+0x10/0x30    __kasan_kmalloc+0xa6/0xb0    alloc_work_entries+0xa9/0x260 [iw_cm]    iw_cm_connect+0x23/0x4a0 [iw_cm]    rdma_connect_locked+0xbfd/0x1920 [rdma_cm]    nvme_rdma_cm_handler+0x8e5/0x1b60 [nvme_rdma]    cma_cm_event_handler+0xae/0x320 [rdma_cm]    cma_work_handler+0x106/0x1b0 [rdma_cm]    process_one_work+0x84f/0x1460    worker_thread+0x5ef/0xfd0    kthread+0x3b0/0x770    ret_from_fork+0x30/0x70    ret_from_fork_asm+0x1a/0x30    Freed by task 147091:    kasan_save_stack+0x2c/0x50    kasan_save_track+0x10/0x30    kasan_save_free_info+0x37/0x60    __kasan_slab_free+0x4b/0x70    kfree+0x13a/0x4b0    dealloc_work_entries+0x125/0x1f0 [iw_cm]    iwcm_deref_id+0x6f/0xa0 [iw_cm]    cm_work_handler+0x136/0x1ba0 [iw_cm]    process_one_work+0x84f/0x1460    worker_thread+0x5ef/0xfd0    kthread+0x3b0/0x770    ret_from_fork+0x30/0x70    ret_from_fork_asm+0x1a/0x30    Last potentially related work creation:    kasan_save_stack+0x2c/0x50    kasan_record_aux_stack+0xa3/0xb0    __queue_work+0x2ff/0x1390    queue_work_on+0x67/0xc0    cm_event_handler+0x46a/0x820 [iw_cm]    siw_cm_upcall+0x330/0x650 [siw]    siw_cm_work_handler+0x6b9/0x2b20 [siw]    process_one_work+0x84f/0x1460    worker_thread+0x5ef/0xfd0    kthread+0x3b0/0x770    ret_from_fork+0x30/0x70    ret_from_fork_asm+0x1a/0x30  This BUG is reproducible by repeating the blktests test case nvme/061 for the rdma transport and the siw driver.  To avoid the use-after-free of cm_id_private work objects, ensure that the last reference to the cm_id is decremented not in the event handler works, but in the cm_id destruction context. For that purpose, mo ---truncated---