SB2014062311 - Improper locking in Linux kernel

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Main Vulnerability Database SB2014062311

SB2014062311 - Improper locking in Linux kernel

Published: June 23, 2014

Security Bulletin ID SB2014062311
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Improper locking (CVE-ID: CVE-2014-4171)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

mm/shmem.c in the Linux kernel through 3.15.1 does not properly implement the interaction between range notification and hole punching, which allows local users to cause a denial of service (i_mutex hold) by using the mmap system call to access a hole, as demonstrated by interfering with intended shmem activity by blocking completion of (1) an MADV_REMOVE madvise call or (2) an FALLOC_FL_PUNCH_HOLE fallocate call.


Remediation

Install update from vendor's website.

References