CVE-2018-1000204

DISPUTED Linux Kernel version 3.18 to 4.16 incorrectly handles an
SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DXFER_FROM_DEV and an empty
6-byte cmdp. This may lead to copying up to 1000 kernel heap pages to the
userspace. This has been fixed upstream in
https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824
already. The problem has limited scope, as users don’t usually have
permissions to access SCSI devices. On the other hand, e.g. the Nero user
manual suggests doing chmod o+r+w /dev/sg* to make the devices
accessible. NOTE: third parties dispute the relevance of this report,
noting that the requirement for an attacker to have both the CAP_SYS_ADMIN
and CAP_SYS_RAWIO capabilities makes it “virtually impossible to exploit.”