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Sid 1-40566

Message

OS-LINUX Linux kernel madvise race condition attempt

Summary

Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect handling of a copy-on-write (COW) feature to write to a read-only memory mapping, as exploited in the wild in October 2016, aka "Dirty COW."

Impact

CVSS base score 7.8 CVSS impact score 5.9 CVSS exploitability score 1.8 confidentialityImpact HIGH integrityImpact HIGH availabilityImpact HIGH

CVE-2016-5195:

CVSS base score 7.8

CVSS impact score 5.9

CVSS exploitability score 1.8

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Detailed information

CVE-2016-5195: Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect handling of a copy-on-write (COW) feature to write to a read-only memory mapping, as exploited in the wild in October 2016, aka "Dirty COW."

Affected systems

  • canonical ubuntu_core 15.04
  • canonical ubuntu_linux 12.04
  • canonical ubuntu_linux 16.04
  • debian debian_linux 7.0
  • debian debian_linux 8.0
  • linux linux_kernel 2.6.39.4
  • linux linux_kernel 3.19.8
  • linux linux_kernel 4.8.2
  • redhat enterprise_linux 5
  • redhat enterprise_linux 6
  • redhat enterprise_linux 7.0
  • redhat enterpriselinuxaus 6.2
  • redhat enterpriselinuxaus 6.4
  • redhat enterpriselinuxaus 6.5
  • redhat enterpriselinuxeus 6.6
  • redhat enterpriselinuxeus 6.7
  • redhat enterpriselinuxeus 7.1
  • redhat enterpriselinuxlong_life 5.6
  • redhat enterpriselinuxlong_life 5.9
  • redhat enterpriselinuxtus 6.5

Ease of attack

CVE-2016-5195:

Access Vector

Access Complexity

Authentication

False positives

None known

False negatives

None known

Corrective action

Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

Contributors

  • Talos research team.
  • This document was generated from data supplied by the national vulnerability database, a product of the national institute of standards and technology.
  • For more information see nvd.

Additional References

  • bugzilla.redhat.com/show_bug.cgi?id=1384344