[RHSA-2015:1139-01] Important: kernel-rt security, bug fix, and enhancement update

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Red Hat Security Advisory

 

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

Advisory ID: RHSA-2015:1139-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1139.html

Issue date: 2015-05-20

Updated on: 2015-06-23

CVE Names: CVE-2014-9420 CVE-2014-9529 CVE-2014-9584

CVE-2015-1573 CVE-2015-1593 CVE-2015-1805

CVE-2015-2830

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

 

1. Summary:

 

Updated kernel-rt packages that fix multiple security issues, 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. Common Vulnerability Scoring System (CVSS) base scores, which give

detailed severity ratings, are available for each vulnerability from the

CVE links in the References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64

 

3. Description:

 

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

operating system.

 

* It was found that the Linux kernel's implementation of vectored pipe read

and write functionality did not take into account the I/O vectors that were

already processed when retrying after a failed atomic access operation,

potentially resulting in memory corruption due to an I/O vector array

overrun. A local, unprivileged user could use this flaw to crash the system

or, potentially, escalate their privileges on the system. (CVE-2015-1805,

Important)

 

* A race condition flaw was found in the way the Linux kernel keys

management subsystem performed key garbage collection. A local attacker

could attempt accessing a key while it was being garbage collected, which

would cause the system to crash. (CVE-2014-9529, Moderate)

 

* A flaw was found in the way the Linux kernel's 32-bit emulation

implementation handled forking or closing of a task with an 'int80' entry.

A local user could potentially use this flaw to escalate their privileges

on the system. (CVE-2015-2830, Low)

 

* It was found that the Linux kernel's ISO file system implementation did

not correctly limit the traversal of Rock Ridge extension Continuation

Entries (CE). An attacker with physical access to the system could use this

flaw to trigger an infinite loop in the kernel, resulting in a denial of

service. (CVE-2014-9420, Low)

 

* An information leak flaw was found in the way the Linux kernel's ISO9660

file system implementation accessed data on an ISO9660 image with RockRidge

Extension Reference (ER) records. An attacker with physical access to the

system could use this flaw to disclose up to 255 bytes of kernel memory.

(CVE-2014-9584, Low)

 

* A flaw was found in the way the nft_flush_table() function of the Linux

kernel's netfilter tables implementation flushed rules that were

referencing deleted chains. A local user who has the CAP_NET_ADMIN

capability could use this flaw to crash the system. (CVE-2015-1573, Low)

 

* An integer overflow flaw was found in the way the Linux kernel randomized

the stack for processes on certain 64-bit architecture systems, such as

x86-64, causing the stack entropy to be reduced by four. (CVE-2015-1593,

Low)

 

Red Hat would like to thank Carl Henrik Lunde for reporting CVE-2014-9420

and CVE-2014-9584. The security impact of CVE-2015-1805 was discovered by

Red Hat.

 

The kernel-rt packages have been upgraded to version 3.10.0-229.7.2, which

provides a number of bug fixes and enhancements over the previous version,

including:

 

* storvsc: get rid of overly verbose warning messages

* storvsc: force discovery of LUNs that may have been removed

* storvsc: in responce to a scan event, scan the hos

* storvsc: NULL pointer dereference fix

* futex: Mention key referencing differences between shared and private

futexes

* futex: Ensure get_futex_key_refs() always implies a barrier

* kernel module: set nx before marking module MODULE_STATE_COMING

* kernel module: Clean up ro/nx after early module load failures

* btrfs: make xattr replace operations atomic

* megaraid_sas: revert: Add release date and update driver version

* radeon: fix kernel segfault in hwmonitor

 

(BZ#1223955)

 

Bug fix:

 

* There is an XFS optimization that depended on a spinlock to disable

preemption using the preempt_disable() function. When CONFIG_PREEMPT_RT is

enabled on realtime kernels, spinlocks do not disable preemption while

held, so the XFS critical section was not protected from preemption.

Systems on the Realtime kernel-rt could lock up in this XFS optimization

when a task that locked all the counters was then preempted by a realtime

task, causing all callers of that lock to block indefinitely. This update

disables the optimization when building a kernel with

CONFIG_PREEMPT_RT_FULL enabled. (BZ#1223955)

 

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.

 

4. Solution:

 

Before applying this update, make sure all previously released errata

relevant to your system have been applied.

 

For details on how to apply this update, refer to:

 

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

 

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

 

1175235 - CVE-2014-9420 Kernel: fs: isofs: infinite loop in CE record entries

1179813 - CVE-2014-9529 kernel: use-after-free during key garbage collection

1180119 - CVE-2014-9584 kernel: isofs: unchecked printing of ER records

1190966 - CVE-2015-1573 kernel: panic while flushing nftables rules that reference deleted chains.

1192519 - CVE-2015-1593 kernel: Linux stack ASLR implementation Integer overflow

1202855 - CVE-2015-1805 kernel: pipe: iovec overrun leading to memory corruption

1208598 - CVE-2015-2830 kernel: int80 fork from 64-bit tasks mishandling

1212083 - kernel-rt: rebase to the RHEL7.1.z batch3 source tree

 

6. Package List:

 

Red Hat Enterprise Linux Realtime (v. 7):

 

Source:

kernel-rt-3.10.0-229.7.2.rt56.141.6.el7_1.src.rpm

 

noarch:

kernel-rt-doc-3.10.0-229.7.2.rt56.141.6.el7_1.noarch.rpm

 

x86_64:

kernel-rt-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-debug-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-debug-debuginfo-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-debug-devel-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-debuginfo-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-debuginfo-common-x86_64-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-devel-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-trace-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-trace-debuginfo-3.10.0-229.7.2.rt56.141.6.el7_1.x86_64.rpm

kernel-rt-trace-devel-3.10.0-229.7.2.rt56.141.6.el7_1.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-2014-9420

https://access.redhat.com/security/cve/CVE-2014-9529

https://access.redhat.com/security/cve/CVE-2014-9584

https://access.redhat.com/security/cve/CVE-2015-1573

https://access.redhat.com/security/cve/CVE-2015-1593

https://access.redhat.com/security/cve/CVE-2015-1805

https://access.redhat.com/security/cve/CVE-2015-2830

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 2015 Red Hat, Inc.

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