CVE-2018-1000204

Aliases:UBUNTU-CVE-2018-1000204DEBIAN-CVE-2018-1000204
Advisory lineage Upstream: 0 Downstream: 20
Modified
Published: 26 Jun 2018, 14:00
Last modified:05 Aug 2024, 12:40

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.3 MEDIUM
v2.0 (nvd)
EPSS Score
1.9% LOW
2% probability +1.66%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

26 Jun 2018, 14:00
Published
Vulnerability first disclosed
05 Aug 2024, 12:40
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.0•MEDIUM•Score: 5.3CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
  • v2.0•MEDIUM•Score: 6.3AV:N/AC:M/Au:S/C:C/I:N/A:N

EPSS Trends

Current EPSS score: 1.90%• Percentile: 79%

Affected Systems

  • canonical•ubuntu_linux

    14.04 | 16.04 | 18.04

  • debian•linux

    < 4.16.12-1 | < 4.16.12-1 | < 4.16.12-1 | < 4.16.12-1

  • ubuntu•linux

    < 3.13.0-157.207 | < 4.4.0-130.156 | < 4.15.0-33.36

  • ubuntu•linux-aws

    < 4.4.0-1024.25 | < 4.4.0-1062.71 | < 4.15.0-1020.20

  • ubuntu•linux-azure

    < 4.15.0-1022.22~16.04.1 | < 4.15.0-1022.23

  • ubuntu•linux-azure-6.11

    all

  • ubuntu•linux-azure-fde

    all

  • ubuntu•linux-azure-fde-5.15

    all

  • ubuntu•linux-fips

    < 4.4.0-1008.10

  • ubuntu•linux-gcp

    < 4.15.0-1018.19~16.04.2 | < 4.15.0-1018.19

  • ubuntu•linux-gcp-6.11

    all

  • ubuntu•linux-gke

    all

  • ubuntu•linux-hwe

    < 4.15.0-33.36~16.04.1

  • ubuntu•linux-hwe-6.11

    all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.4.0-1029.34 | < 4.15.0-1020.20

  • ubuntu•linux-lowlatency-hwe-6.11

    all

  • ubuntu•linux-lts-xenial

    < 4.4.0-130.156~14.04.1

  • ubuntu•linux-oem

    < 4.15.0-1017.20

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.4.0-1092.100 | < 4.15.0-1021.23 | all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all | all

  • ubuntu•linux-snapdragon

    < 4.4.0-1095.100

  • debian•debian_linux

    8.0

  • linux•linux_kernel

    ≥ 3.18, ≤ 4.16

References (23)