A flaw was found in QEMU, in the virtio-scsi, virtio-blk, and virtio-crypto devices. The size for virtqueue_push as set in virtio_scsi_complete_req / virtio_blk_req_complete / virito_crypto_req_complete could be larger than the true size of the data which has been sent to guest. Once virtqueue_push() finally calls dma_memory_unmap to ummap the in_iov, it may call the address_space_write function to write back the data. Some uninitialized data may exist in the bounce.buffer, leading to an information leak.
Exploitability
AV:LAC:LPR:LUI:NScope
S:CImpact
C:LI:NA:N3.8/CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:NInformation Disclosure