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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2018-06-26T14:00:00

Updated: 2024-08-05T12:40:46.834Z

Reserved: 2018-06-08T00:00:00

Link: CVE-2018-1000204

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2018-06-26T14:29:02.160

Modified: 2024-08-05T13:15:38.547

Link: CVE-2018-1000204

cve-icon Redhat

Severity : Low

Publid Date: 2018-05-18T00:00:00Z

Links: CVE-2018-1000204 - Bugzilla