diff options
Diffstat (limited to 'gitlab/issues_text/target_missing/host_missing/accel_missing/782')
| -rw-r--r-- | gitlab/issues_text/target_missing/host_missing/accel_missing/782 | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gitlab/issues_text/target_missing/host_missing/accel_missing/782 b/gitlab/issues_text/target_missing/host_missing/accel_missing/782 new file mode 100644 index 000000000..b69e00482 --- /dev/null +++ b/gitlab/issues_text/target_missing/host_missing/accel_missing/782 @@ -0,0 +1,5 @@ +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. |