RHEL 6 : kernel (RHSA-2014:0520)
Critical Nessus Plugin ID 79021
SynopsisThe remote Red Hat host is missing one or more security updates.
DescriptionUpdated kernel packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 6.2 Extended Update Support.
The Red Hat Security Response Team 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 flaw was found in the way the Linux kernel processed an authenticated COOKIE_ECHO chunk during the initialization of an SCTP connection. A remote attacker could use this flaw to crash the system by initiating a specially crafted SCTP handshake in order to trigger a NULL pointer dereference on the system. (CVE-2014-0101, Important)
* A race condition flaw, leading to heap-based buffer overflows, was found in the way the Linux kernel's N_TTY line discipline (LDISC) implementation handled concurrent processing of echo output and TTY write operations originating from user space when the underlying TTY driver was PTY. An unprivileged, local user could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2014-0196, Important)
Red Hat would like to thank Nokia Siemens Networks for reporting CVE-2014-0101.
This update also fixes the following bug :
* Prior to this update, a guest-provided value was used as the head length of the socket buffer allocated on the host. If the host was under heavy memory load and the guest-provided value was too large, the allocation could have failed, resulting in stalls and packet drops in the guest's Tx path. With this update, the guest-provided value has been limited to a reasonable size so that socket buffer allocations on the host succeed regardless of the memory load on the host, and guests can send packets without experiencing packet drops or stalls.
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.