RHEL 6 : kernel-rt (RHSA-2016:1341)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

An update for kernel-rt is now available for Red Hat Enterprise MRG
2.5.

Red Hat Product Security has rated this update as having a security
impact of Important. 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.

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

This update provides a build of the kernel-rt package for Red Hat
Enterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and
provides a number of bug fixes including :

* [netdrv] ixgbevf: fix spoofed packets with random MAC and use
ether_addr_copy instead of memcpy * [mm] mmu_notifier: fix memory
corruption * [mm] hugetlbfs: optimize when NUMA=n * [mm] optimize
put_mems_allowed() usage * [x86] mm: suitable memory should go to
ZONE_MOVABLE * [fs] xfs: fix splice/direct-IO deadlock * [acpi]
tables: Add acpi_subtable_proc to ACPI table parsers * [acpi] table:
Add new function to get table entries * [net] ipv6: Nonlocal bind *
[net] ipv4: bind ip_nonlocal_bind to current netns

(BZ#1332298)

Security Fix(es) :

* A flaw was found in the way certain interfaces of the Linux kernel's
Infiniband subsystem used write() as bi-directional ioctl()
replacement, which could lead to insufficient memory security checks
when being invoked using the splice() system call. A local
unprivileged user on a system with either Infiniband hardware present
or RDMA Userspace Connection Manager Access module explicitly loaded,
could use this flaw to escalate their privileges on the system.
(CVE-2016-4565, Important)

* A race condition flaw was found in the way the Linux kernel's SCTP
implementation handled sctp_accept() during the processing of
heartbeat timeout events. A remote attacker could use this flaw to
prevent further connections to be accepted by the SCTP server running
on the system, resulting in a denial of service. (CVE-2015-8767,
Moderate)

* A flaw was found in the way the realtime kernel processed specially
crafted ICMP echo requests. A remote attacker could use this flaw to
trigger a sysrql function based on values in the ICMP packet, allowing
them to remotely restart the system. Note that this feature is not
enabled by default and requires elevated privileges to be configured.
(CVE-2016-3707, Moderate)

Red Hat would like to thank Jann Horn for reporting CVE-2016-4565.

Bug Fix(es) :

* An oops can occur in the hpsa driver while submitting ioaccel2
commands when the phys_disk pointer is NULL (in
hpsa_scsi_ioaccel_raid_map). Configuration changes during I/O
operations could set the phys_disk pointer to NULL. In this case, send
the command down the RAID path for correct processing, avoiding the
oops. (BZ#1334260)

* A faulty code merge left an extra spin_lock operation in the
function fscache_invalidate_write(). The code has been correctly
updated to remove this extra lock operation, which avoids a potential
deadlock situation when looping through cache pages. (BZ#1327730)

See also :

https://www.redhat.com/security/data/cve/CVE-2015-8767.html
https://www.redhat.com/security/data/cve/CVE-2016-3707.html
https://www.redhat.com/security/data/cve/CVE-2016-4565.html
http://rhn.redhat.com/errata/RHSA-2016-1341.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 91872 ()

Bugtraq ID:

CVE ID: CVE-2015-8767
CVE-2016-3707
CVE-2016-4565

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