Scientific Linux Security Update : kernel on SL5.x i386/x86_64
Medium Nessus Plugin ID 82638
SynopsisThe remote Scientific Linux host is missing one or more security updates.
Description- It was found that the Linux kernel's Infiniband subsystem did not properly sanitize input parameters while registering memory regions from user space via the (u)verbs API. A local user with access to a /dev/infiniband/uverbsX device could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2014-8159, Important)
- An insufficient bound checking flaw was found in the Xen hypervisor's implementation of acceleration support for the 'REP MOVS' instructions. A privileged HVM guest user could potentially use this flaw to crash the host.
This update also fixes the following bugs :
- Under memory pressure, cached data was previously flushed to the backing server using the PID of the thread responsible for flushing the data in the Server Message Block (SMB) headers instead of the PID of the thread which actually wrote the data. As a consequence, when a file was locked by the writing thread prior to writing, the server considered writes by the thread flushing the pagecache as being a separate process from writing to a locked file, and thus rejected the writes.
In addition, the data to be written was discarded. This update ensures that the correct PID is sent to the server, and data corruption is avoided when data is being written from a client under memory pressure.
The system must be rebooted for this update to take effect.
SolutionUpdate the affected packages.