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-id = 782
-title = "nvme: DMA reentrancy issue leads to use-after-free (CVE-2021-3929)"
-state = "closed"
-created_at = "2021-12-17T09:33:18.851Z"
-closed_at = "2022-03-18T18:59:49.094Z"
-labels = ["Fuzzer", "Security", "Storage"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/782"
-host-os = "n/a"
-host-arch = "n/a"
-qemu-version = "n/a"
-guest-os = "n/a"
-guest-arch = "n/a"
-description = """A DMA reentrancy issue was found in the NVM Express Controller (NVMe) emulation. Functions dma_buf_write() or dma_buf_read() in hw/nvme/ctrl.c:nvme_tx() can be called without checking if the destination region overlaps with device's MMIO. This is similar to CVE-2021-3750 (https://gitlab.com/qemu-project/qemu/-/issues/541) and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.
-
-This issue was reported by Qiuhao Li."""
-reproduce = "n/a"
-additional = "n/a"