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device: 0.858
vnc: 0.750
network: 0.682
graphic: 0.585
semantic: 0.454
files: 0.398
other: 0.374
PID: 0.351
socket: 0.328
boot: 0.304
permissions: 0.144
debug: 0.121
performance: 0.087
KVM: 0.076
nvme: DMA reentrancy issue leads to use-after-free (CVE-2021-3929)
Description of problem:
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.
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