CVE-2026-89507
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability in the Linux kernel RDMA/ucma module: ucma_write_cm_event() does not take the handler lock. While ucma_migrate_id() moves a context to another file, ctx->file can be swapped mid-sequence, causing list corruption, a permanently held mutex, and a process stuck in D state. The flaw is reachable by an unprivileged user via /dev/infiniband/rdma_cm.
Risk Assessment
An unprivileged user can trigger kernel memory corruption and thread hangs, leading to denial of service (DoS) or potential privilege escalation. Systems with RDMA/ucma enabled are affected even without a physical RDMA device.
Recommendation
Update the Linux kernel to a version containing the fix that adds the handler lock in ucma_write_cm_event(). If updating is not possible, consider restricting access to /dev/infiniband/rdma_cm or disabling the RDMA/ucma module if unused.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: RDMA/ucma: Lock the handler in ucma_write_cm_event() ctx->file may only be changed under the handler lock and the xa_lock, which is what stops uevents being queued for a ctx while ucma_migrate_id() moves it to another file. The CM core takes that lock before invoking ucma_event_handler(), but the write() paths that queue uevents themselves do not. ucma_write_cm_event() re-reads ctx->file for each of its four dereferences, so ucma_migrate_id() can swap it mid-sequence: mutex_lock(&ctx->file->mut); /* file A */ list_add_tail(&uevent->list, &ctx->file->event_list); /* file B */ mutex_unlock(&ctx->file->mut); /* file B */ wake_up_interruptible(&ctx->file->poll_wait); /* file B */ The window is the mutex_lock() itself: the writer sleeps in it while the migration reassigns ctx->file. The list_add_tail() then runs on file B's event_list holding only file A's mutex: list_add corruption. prev->next should be next (ffff888101320f30), but was ffff88814a08c418. (prev=ffff88814a075c18). kernel BUG at lib/list_debug.c:32! Call Trace: ucma_write_cm_event+0x36e/0x5e0 and file A's mut is left held forever, wedging its next writer in D state. The uevent is also stranded on a list ucma_cleanup_ctx_events() will not walk, so it outlives its context. /dev/infiniband/rdma_cm is 0666 and no RDMA device is involved, so an unprivileged user reaches all of this. Take the handler lock, as ucma_cleanup_mc_events() does; ctx->cm_id is pinned by the ucma_get_ctx() reference.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS