RHEL 7 : kernel-rt (RHSA-2015:0981)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.

Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated kernel-rt packages that fix one security issue, several bugs,
and add various enhancements are now available for Red Hat Enterprise
Linux 7.

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

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

* A buffer overflow flaw was found in the way the Linux kernel's Intel
AES-NI instructions optimized version of the RFC4106 GCM mode
decryption functionality handled fragmented packets. A remote attacker
could use this flaw to crash, or potentially escalate their privileges
on, a system over a connection with an active AEC-GCM mode IPSec
security association. (CVE-2015-3331, Important)

The kernel-rt packages have been upgraded to version 3.10.0-229.4.1,
which provides a number of bug fixes and enhancements over the
previous version, including :

* Audit subsystem not resolving path name on directory watches

* audit watches do not track correctly after a rename

* auditctl output is changed in RHEL 7

* megaraid_sas: non-booting system with intel_iommu=on kernel

* GFS2: kernel NULL pointer dereference in gfs2_inplace_reserve

* Crypto adapter cannot be brought online - affect all HW

* crypto/seqiv.c: wrong check of return code from crypto_rng_get_bytes

* Backport crypto: sha256_ssse3 - also test for BMI2

* NULL pointer at team_handle_frame+0x62/0x100 [team]

* AES CTR x86_64 'by8' AVX optimization

* Intel RDSEED - Fix for entropy counting

* Intel SHA1 multi-buffer crypto implementation

* Intel SHA1 AVX2 optimization support

* mlx4_en: HW timestamp ends up in error queue of socket which does
not have SO_TIMESTAMPING enabled


This update also fixes the following bugs :

* Prior to this update, heavy lock contention occurred on systems with
greater than 32 cores when large numbers of tasks went idle
simultaneously. Consequently, all the idle CPUs attempted to acquire
the run-queue (rq) lock of a CPU with extra tasks in order to pull
those run-able tasks. This increased scheduler latency due to the lock
contention. Instead of each idle CPU attempting to acquire the
run-queue lock, now each idle CPU will send an IPI to let the
overloaded CPU select one core to pull tasks from it. The result is
less spin-lock contention on the rq lock and produces improved
scheduler response time. (BZ#1210924)

* The CONFIG_NO_HZ logic enabled/disabled the timer tick every time a
CPU went into an idle state. This timer tick manipulation caused the
system performance (throughput) to suffer. The CONFIG_NO_HZ
configuration setting is now turned off by default, which increases
the throughput due to the lower idle overhead while allowing system
administrators to enable it selectively in their environment.

All kernel-rt users are advised to upgrade to these updated packages,
which correct these issues and add these enhancements. The system must
be rebooted for this update to take effect.

See also :


Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 9.3
CVSS Temporal Score : 6.9
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 83424 ()

Bugtraq ID:

CVE ID: CVE-2015-3331

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