Use After Free Affecting torvalds/linux package, versions [,5.5)


Severity

Recommended
0.0
medium
0
10

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

Threat Intelligence

EPSS
0.02% (5th percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3006422
  • published26 Jan 2022
  • disclosed8 May 2020
  • creditUnknown

Introduced: 8 May 2020

CVE-2020-10690  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 5.5 or higher.

Overview

Affected versions of this package are vulnerable to Use After Free. There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation. When a (high privileged) process allocates a ptp device file (like /dev/ptpX) and voluntarily goes to sleep. During this time if the underlying device is removed, it can cause an exploitable condition as the process wakes up to terminate and clean all attached files. The system crashes due to the cdev structure being invalid (as already freed) which is pointed to by the inode.

CVSS Base Scores

version 3.1