Vulnerability in Linux Kernel
CVE-2018-1000204
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.019 (78.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: -0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 8.0
References
- usn.ubuntu.com/3752-2/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/07/msg00015.html (mailing-list, Third Party Advisory)
- usn.ubuntu.com/3696-1/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3752-3/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/07/msg00016.html (mailing-list, Third Party Advisory)
- www.openwall.com/lists/oss-security/2018/06/26/3 (Mailing List, Third Party Advisory)
- usn.ubuntu.com/3754-1/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/07/msg00020.html (mailing-list, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:2948 (vendor-advisory, Third Party Advisory)
- github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-1000204?
- CVE-2018-1000204 is a medium-severity vulnerability in Linux Kernel. CVSS score: 5.3/10. Published 2018-06-26.
- How severe is CVE-2018-1000204?
- Medium severity. CVSS v3 base score is 5.3 out of 10.