{"id":"CVE-2018-1000204","details":"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.","modified":"2026-03-12T22:43:02.065936Z","published":"2018-06-26T14:29:02.160Z","related":["SUSE-SU-2018:1761-1","SUSE-SU-2018:1762-1","SUSE-SU-2018:1855-1","SUSE-SU-2018:1855-2","SUSE-SU-2018:2092-1","SUSE-SU-2018:2332-1","SUSE-SU-2018:2366-1","SUSE-SU-2018:2637-1","SUSE-SU-2019:1245-1"],"references":[{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2018/06/26/3"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2018:2948"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3752-1/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3752-3/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3754-1/"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00020.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3696-1/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3696-2/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3752-2/"},{"type":"FIX","url":"https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"3.18"},{"last_affected":"4.16"}]},{"events":[{"introduced":"0"},{"last_affected":"14.04"}]},{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-1000204.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}