This would take place as far as possible during the off-peak hours. A reboot is required to complete the upgrade. The downtime should not exceed 30 minutes and it will be minimize as much as possible.
This update is scheduled as follows:
Date: 10 May 2014 (Saturday) to 12 May 2014 (Monday)
Time: Between 2AM and 8AM EST#
Kernel security and bug fix update for all CentOS 5 and 6 servers
Details of CentOS 5 security update
* A flaw was found in the way the Linux kernel's TCP/IP protocol suite implementation handled TCP packets with both the SYN and FIN flags set. A remote attacker could use this flaw to consume an excessive amount of resources on the target system, potentially resulting in a denial of
service. (CVE-2012-6638, Moderate)
* A flaw was found in the way the Linux kernel handled HID (Human Interface Device) reports with an out-of-bounds Report ID. An attacker with physical access to the system could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2013-2888, Moderate)
This update also fixes the following bugs:
* A previous change to the sunrpc code introduced a race condition between the rpc_wake_up_task() and rpc_wake_up_status() functions. A race between threads operating on these functions could result in a deadlock situation, subsequently triggering a "soft lockup" event and rendering the system unresponsive. This problem has been fixed by re-ordering tasks in the RPC wait queue. (BZ#1073731)
* Running a process in the background on a GFS2 file system could sometimes trigger a glock recursion error that resulted in a kernel panic. This happened when a readpage operation attempted to take a glock that had already been held by another function. To prevent this error, GFS2 now verifies whether the glock is already held when performing the readpage operation. (BZ#1073953)
* A previous patch backport to the IUCV (Inter User Communication Vehicle) code was incomplete. Consequently, when establishing an IUCV connection, the kernel could, under certain circumstances, dereference a NULL pointer, resulting in a kernel panic. A patch has been applied to correct this
problem by calling the proper function when removing IUCV paths. (BZ#1077045)
In addition, this update adds the following enhancement:
* The lpfc driver had a fixed timeout of 60 seconds for SCSI task management commands. With this update, the lpfc driver enables the user to set this timeout within the range from 5 to 180 seconds. The timeout can be changed by modifying the "lpfc_task_mgmt_tmo" parameter for the lpfc driver. (BZ#1073123)
Details of CentOS 6 security update:
* A flaw was found in the way the Linux kernel's Adaptec RAID controller (aacraid) checked permissions of compat IOCTLs. A local attacker could use this flaw to bypass intended security restrictions. (CVE-2013-6383, Moderate)
* A flaw was found in the way the handle_rx() function handled large network packets when mergeable buffers were disabled. A privileged guest user could use this flaw to crash the host or corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2014-0077, Moderate)
The CVE-2014-0077 issue was discovered by Michael S. Tsirkin of Red Hat.
This update also fixes several bugs.
Cuma, Mayıs 9, 2014
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