CVE-2017-18344

Advisory lineage Upstream: 0 Downstream: 28
Modified
Published: 26 Jul 2018, 19:00
Last modified:05 Aug 2024, 21:20

Vulnerability Summary

Overall Risk (default)
medium
35/100
CVSS Score
5.5 MEDIUM
v3.0 (nvd)
EPSS Score
12.86% MEDIUM
13% probability +2.51%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

26 Jul 2018, 19:00
Published
Vulnerability first disclosed
05 Aug 2024, 21:20
Last Modified
Vulnerability information updated

Description

The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

CVSS Metrics

  • v3.0•MEDIUM•Score: 5.5CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
  • v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 12.86%• Percentile: 94%

Techniques & Countermeasures

  • CWE-125•Out-of-bounds Read

    The product reads data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • canonical•ubuntu_linux

    12.04 | 14.04

  • linux•linux_kernel

    < 4.14.8

  • redhat•enterprise_linux_desktop

    7.0

  • redhat•enterprise_linux_server

    7.0

  • redhat•enterprise_linux_server_aus

    7.2 | 7.3 | 7.4

  • redhat•enterprise_linux_server_eus

    7.3 | 7.5

  • redhat•enterprise_linux_server_tus

    7.2 | 7.3 | 7.4

  • redhat•enterprise_linux_workstation

    7.0

  • redhat•mrg_realtime

    2.0

References (15)