CentOS Linux Kernel Update 2.6.32-504.23.4 Released

CentOS 6 Linux kernel 2.6.32-504.16.2 was released on 09 June.

Update type(s): security, bugfix and enhancement

Resolved CVEs:

CVE-2014-9419
CVE-2014-9420
CVE-2014-9585
CVE-2015-1805
CVE-2015-3331

* 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 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 AES-GCM mode IPSec security association.
(CVE-2015-3331, Important)

* An information leak flaw was found in the way the Linux kernel changed
certain segment registers and thread-local storage (TLS) during a context
switch. A local, unprivileged user could use this flaw to leak the user
space TLS base address of an arbitrary process. (CVE-2014-9419, 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 Virtual
Dynamic Shared Object (vDSO) implementation performed address
randomization. A local, unprivileged user could use this flaw to leak
kernel memory addresses to user-space. (CVE-2014-9585, Low)

Full details can be found here.

Updating the Kernel

You can either initiate a full yum update:

yum update
Alternatively, just update the kernel packages:
yum update "kernel-*"

Cached repo data can also prevent new updates from being found. To clear your yum cache, run:

yum clean all
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About Author: Curtis K

Hi! My name is Curtis, and I am the creator of CentOS Blog. Please feel free to comment any suggestions, feedback or questions on my posts!