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CVE-2026-43128 is a Linux kernel vulnerability in the RDMA/umem subsystem caused by incorrect cleanup handling in ib_umem_dmabuf_get_pinned_with_dma_device(). When ib_umem_dmabuf_map_pages() fails, the vulnerable error path immediately calls dma_buf_unpin() but leaves the umem_dmabuf->pinned state set. During later teardown, ib_umem_release() invokes ib_umem_dmabuf_revoke(), which can call dma_buf_unpin() again based on that stale pinned state, resulting in a double unpin condition. The fix removes the immediate unpin from the failure path and relies on the normal release and revoke cleanup path to perform the operation once, while also preserving correct unmap-before-unpin unwind ordering when the mapping failure occurs after reservation waiting and a scatter-gather table has already been established.
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A Linux kernel RDMA/umem vulnerability involving double dma_buf_unpin in a failure path, fixed in this Red Hat kernel update.
A Linux kernel vulnerability in RDMA/umem caused by a double dma_buf_unpin in a failure path.
A Linux kernel RDMA/umem vulnerability involving a double dma_buf_unpin in a failure path, fixed in this Red Hat kernel-rt update.
A Linux kernel vulnerability in RDMA/umem involving a double dma_buf_unpin in a failure path.
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Cross-references every affected SKU, including bundled OEM variants.
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