RHEL 6 : kernel (RHSA-2015:0284)
Medium Nessus Plugin ID 81624
SynopsisThe remote Red Hat host is missing one or more security updates.
DescriptionUpdated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.5 Extended Update Support.
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.
The kernel packages contain the Linux kernel, the core of any Linux operating system.
* A race condition flaw was found in the way the Linux kernel's KVM subsystem handled PIT (Programmable Interval Timer) emulation. A guest user who has access to the PIT I/O ports could use this flaw to crash the host. (CVE-2014-3611, Important)
* A flaw was found in the way the Linux kernel's SCTP implementation validated INIT chunks when performing Address Configuration Change (ASCONF). A remote attacker could use this flaw to crash the system by sending a specially crafted SCTP packet to trigger a NULL pointer dereference on the system. (CVE-2014-7841, Important)
* A flaw was found in the way the ipc_rcu_putref() function in the Linux kernel's IPC implementation handled reference counter decrementing. A local, unprivileged user could use this flaw to trigger an Out of Memory (OOM) condition and, potentially, crash the system. (CVE-2013-4483, Moderate)
* A memory corruption flaw was found in the way the USB ConnectTech WhiteHEAT serial driver processed completion commands sent via USB Request Blocks buffers. 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-2014-3185, Moderate)
* It was found that the Linux kernel's KVM subsystem did not handle the VM exits gracefully for the invept (Invalidate Translations Derived from EPT) and invvpid (Invalidate Translations Based on VPID) instructions. On hosts with an Intel processor and invept/invppid VM exit support, an unprivileged guest user could use these instructions to crash the guest. (CVE-2014-3645, CVE-2014-3646, Moderate)
* A flaw was found in the way the Linux kernel's netfilter subsystem handled generic protocol tracking. As demonstrated in the Stream Control Transmission Protocol (SCTP) case, a remote attacker could use this flaw to bypass intended iptables rule restrictions when the associated connection tracking module was not loaded on the system.
Red Hat would like to thank Lars Bull of Google for reporting CVE-2014-3611, Vladimir Davydov (Parallels) for reporting CVE-2013-4483, and the Advanced Threat Research team at Intel Security for reporting CVE-2014-3645 and CVE-2014-3646. The CVE-2014-7841 issue was discovered by Liu Wei of Red Hat.
Bug fixes :
* When forwarding a packet, the iptables target TCPOPTSTRIP used the tcp_hdr() function to locate the option space. Consequently, TCPOPTSTRIP located the incorrect place in the packet, and therefore did not match options for stripping. TCPOPTSTRIP now uses the TCP header itself to locate the option space, and the options are now properly stripped. (BZ#1172026)
* The ipset utility computed incorrect values of timeouts from an old IP set, and these values were then supplied to a new IP set. A resize on an IP set with a timeouts option enabled could then supply corrupted data from an old IP set. This bug has been fixed by properly reading timeout values from an old set before supplying them to a new set. (BZ#1172763)
* Incorrect processing of errors from the BCM5719 LAN controller could result in incoming packets being dropped. Now, received errors are handled properly, and incoming packets are no longer randomly dropped.
* When the NVMe driver allocated a name-space queue, it was recognized as a request-based driver, whereas it was a BIO-based driver. While trying to access data during the loading of NVMe along with a request-based DM device, the system could terminate unexpectedly or become unresponsive. Now, NVMe does not set the QUEUE_FLAG_STACKABLE flag during the allocation of a name-space queue, and the system no longer attempts to insert a request into the queue, preventing a crash. (BZ#1180554)
All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.
SolutionUpdate the affected packages.