CVE-2016-6198

Impact:
Moderate
Public Date:
2016-07-11
CWE:
CWE-362
Bugzilla:
1355654: CVE-2016-6198 kernel: vfs: missing detection of hardlinks in vfs_rename() on overlayfs
A flaw was found that the vfs_rename() function did not detect hard links on overlayfs. A local, unprivileged user could use the rename syscall on overlayfs on top of xfs to crash the system.

Find out more about CVE-2016-6198 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue is not present in the Linux kernel packages as shipped with Red Hat Enterprise Linux versions 5 and 6.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.

CVSS v2 metrics

Base Score 4.7
Base Metrics AV:L/AC:M/Au:N/C:N/I:N/A:C
Access Vector Local
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete

CVSS v3 metrics

CVSS3 Base Score 5.5
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact None
Availability Impact High

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (kernel) RHSA-2016:1847 2016-09-15
Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) RHSA-2016:2584 2016-11-03
Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) RHSA-2016:1875 2016-09-15
Red Hat Enterprise Linux 7 (kernel) RHSA-2016:2574 2016-11-03

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 realtime-kernel Will not fix
Red Hat Enterprise Linux 6 kernel Not affected
Red Hat Enterprise Linux 5 kernel Not affected

Acknowledgements

This issue was discovered by CAI Qian (Red Hat).
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