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Red Hat Security Advisory

 

Synopsis: Important: kernel-rt security and bug fix update

Advisory ID: RHSA-2016:1341-01

Product: Red Hat Enterprise MRG for RHEL-6

Advisory URL: https://access.redhat.com/errata/RHSA-2016:1341

Issue date: 2016-06-27

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

=====================================================================

 

1. Summary:

 

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.

 

2. Relevant releases/architectures:

 

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

 

3. Description:

 

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)

 

4. Solution:

 

For details on how to apply this update, which includes the changes

described in this advisory, refer to:

 

https://access.redhat.com/articles/11258

 

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

 

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

 

1297389 - CVE-2015-8767 kernel: SCTP denial of service during timeout

1310570 - CVE-2016-4565 kernel: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko

1327484 - CVE-2016-3707 kernel-rt: Sending SysRq command via ICMP echo request

1327730 - deadlock in fscache code (merge error) [mrg]

1332298 - update the MRG 2.5.z 3.10 kernel-rt sources

 

6. Package List:

 

MRG Realtime for RHEL 6 Server v.2:

 

Source:

kernel-rt-3.10.0-327.rt56.190.el6rt.src.rpm

 

noarch:

kernel-rt-doc-3.10.0-327.rt56.190.el6rt.noarch.rpm

kernel-rt-firmware-3.10.0-327.rt56.190.el6rt.noarch.rpm

 

x86_64:

kernel-rt-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-debug-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-debug-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-debug-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-trace-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-trace-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-trace-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-vanilla-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.190.el6rt.x86_64.rpm

kernel-rt-vanilla-devel-3.10.0-327.rt56.190.el6rt.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2015-8767

https://access.redhat.com/security/cve/CVE-2016-3707

https://access.redhat.com/security/cve/CVE-2016-4565

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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