Out-of-bounds Read Affecting torvalds/linux package, versions [,4.14.8)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
8.79% (93rd percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3006153
  • published26 Jan 2022
  • disclosed26 Jul 2018
  • creditUnknown

Introduced: 26 Jul 2018

CVE-2017-18344  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 4.14.8 or higher.

Overview

Affected versions of this package are vulnerable to Out-of-bounds Read. 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 Base Scores

version 3.1