Executive Summary

Titlekernel security and bug fix update
NameRHSA-2019:0324First vendor Publication2019-02-12
VendorRedHatLast vendor Modification2019-02-12
Severity (Vendor) N/ARevision01

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:N/I:P/A:N)
Cvss Base Score2.1Attack RangeLocal
Cvss Impact Score2.9Attack ComplexityLow
Cvss Expoit Score3.9AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores


Problem Description:

An update for kernel is now available for Red Hat Enterprise Linux 7.4 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

* The timeout handling in the libfc.ko kernel module did not work correctly. This was happening during certain steps of the Fibre Channel login procedure, when the timeout handling was not synchronized with the state of a partially offloaded Fibre Channel over Ethernet (FCoE) in the lower-level driver. Consequently, the offloaded FCoE state was incorrect, which led to I/O timeout errors until the SCSI error recovery issued a host reset. This update fixes the bug by improving the libfc.ko error handling during the fabric login. As a result, the fabric login errors are addressed in time, without the I/O timeouts in the described scenario. (BZ#1655042)

* Symmetric Multi-Processing (SMP) or Non-Uniform Memory Access (NUMA) systems in some cases experienced deadlocks during a task migration and task wakeup operations. Consequently, the systems terminated unexpectedly with the following message:

NMI watchdog: Watchdog detected hard LOCKUP on

This update fixes the bug by queueing the stopper thread to run after locks are released. As a result, the deadlocks and the system crashes no longer occur in the described scenario. (BZ#1667326)

Users of kernel are advised to upgrade to these updated packages, which fix these bugs.

4. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:


The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1641548 - CVE-2018-18397 kernel: userfaultfd bypasses tmpfs file permissions

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2019-0324.html

CPE : Common Platform Enumeration


Alert History

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2019-02-17 13:18:10
  • First insertion