In the Linux kernel, the following vulnerability has been resolved:
vhost-scsi: flush backend after device ioctls
vhost-scsi translates guest response descriptors into userspace iovecs
when commands are submitted. Target-core completes those commands
asynchronously, so VHOST_SET_MEM_TABLE can replace the memory table while
an in-flight command still retains response iovecs translated through the
old table. If the old mapping is reused after VHOST_SET_MEM_TABLE returns, command
completion can write the response to an unrelated userspace object.
Flush the vhost-scsi backend after vhost_dev_ioctl() handles a device
ioctl. This waits for in-flight commands that can still use the old
response iovecs before the ioctl returns.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 3
https://git.kernel.org/stable/c/22598f55a4c2b510b3df5e69e563387a963222ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6c1b802e36b05ebd9d41686c4dce6f06966af469
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/981c97d09c6b9560bb12dcc41f11ce59b1a48e97
416baaa9-dc9f-4396-8d5f-8c081fb06d67