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
25/100
CVSS Score
6.3 MEDIUM
v2.0 (nvd)
EPSS Score
0.13% LOW
0% probability -0.10%
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: 0.13%• Percentile: 32%

Affected Systems

  • canonical•ubuntu_linux

    14.04 | 16.04 | 18.04

  • debian•debian_linux

    8.0

  • linux•linux_kernel

    ≥ 3.18, ≤ 4.16

References (13)