Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:vhost-scsi: protect vq->log_used with vq->mutexThe vhost-scsi completion path may access vq->log_base when vq->log_used isalready set to false. vhost-thread QEMU-threadvhost_scsi_complete_cmd_work()-> vhost_add_used() -> vhost_add_used_n() if (unlikely(vq->log_used)) QEMU disables vq->log_used via VHOST_SET_VRING_ADDR. mutex_lock(&vq->mutex); vq->log_used = false now! mutex_unlock(&vq->mutex); QEMU gfree(vq->log_base) log_used() -> log_write(vq->log_base)Assuming the VMM is QEMU. The vq->log_base is from QEMU userpace and can bereclaimed via gfree(). As a result, this causes invalid memory writes toQEMU userspace.The control queue path has the same issue.
No PoCs from references.
- https://github.com/w4zu/Debian_security